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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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loan bank advances outstanding.","units":{"USD":[{"end":"2011-12-31","val":51428000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"},{"end":"2012-12-31","val":65859000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"end":"2012-12-31","val":65900000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":124900000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15"},{"end":"2013-12-31","val":124900000,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2013Q4I"},{"end":"2014-12-31","val":141800000,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26"},{"end":"2014-12-31","val":141800000,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":137900000,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":137900000,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":146800000,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummary":{"label":"Federal Home Loan Bank, Advances (Deprecated 2013-01-31)","description":"Amount of federal home loan bank advances. Advances are loans from the federal home loan bank system to a member (shareholder).","units":{"USD":[{"end":"2011-12-31","val":40036000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"},{"end":"2012-12-31","val":7498000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAfterFiveYearsFromBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, after Year Five","description":"Weighted average interest rate of advance from Federal Home Loan Bank (FHLBank) due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"pure":[{"end":"2012-12-31","val":0.0434,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.0242,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.0544,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":0.0544,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0.0544,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Five","description":"Weighted average interest rate of advance from Federal Home Loan Bank (FHLBank) due in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"pure":[{"end":"2013-12-31","val":0.0112,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.0179,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0544,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year One","description":"Weighted average interest rate of advance from Federal Home Loan Bank (FHLBank) due in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"pure":[{"end":"2012-12-31","val":0.0308,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0084,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0.0112,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Two","description":"Weighted average interest rate of advance from Federal Home Loan Bank (FHLBank) due in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"pure":[{"end":"2012-12-31","val":0.041,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.0027,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0084,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":0.0115,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0.0179,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Four","description":"Weighted average interest rate of advance from Federal Home Loan Bank (FHLBank) due in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"pure":[{"end":"2012-12-31","val":0,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.0084,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.0112,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0179,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Three","description":"Weighted average interest rate of advance from Federal Home Loan Bank (FHLBank) due in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"pure":[{"end":"2012-12-31","val":0.0494,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.0051,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.0084,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0112,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":0.0179,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, after Year Five","description":"Amount of advance from Federal Home Loan Bank (FHLBank) maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2011-12-31","val":2617000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"},{"end":"2012-12-31","val":2108000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterRollingYearFive":{"label":"Federal Home Loan Bank, Advances, Maturities Summary, Due after Rolling Year Five","description":"Amount of advances from Federal Home Loan Bank (FHLBank) maturing after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2015-12-31","val":366000,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":333000,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, Year Two","description":"Amount of advance from Federal Home Loan Bank (FHLBank) maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2011-12-31","val":1415000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"},{"end":"2012-12-31","val":888000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, Year Three","description":"Amount of advance from Federal Home Loan Bank (FHLBank) maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2011-12-31","val":5206000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"},{"end":"2012-12-31","val":4048000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueInNextRollingTwelveMonths":{"label":"Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Rolling Twelve Months","description":"Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":888000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":7257000,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":1530000,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":1530000,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":590000,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRemainderOfFiscalYear":{"label":"Federal Home Loan Bank, Advance, Maturity, Remainder of Fiscal Year","description":"Amount of advance from Federal Home Loan Bank (FHLBank) maturing in remainder of current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2011-12-31","val":29500000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"},{"end":"2012-12-31","val":454000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFive":{"label":"Federal Home Loan Bank, Advances, Maturities Summary, Due in Rolling Year Five","description":"Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":2108000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":2461000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":397000,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFour":{"label":"Federal Home Loan Bank, Advances, Maturities Summary, Due in Rolling Year Four","description":"Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":0,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":590000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":2034000,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":366000,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearThree":{"label":"Federal Home Loan Bank, Advances, Maturities Summary, Due in Rolling Year Three","description":"Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":0,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":1530000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":590000,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":2034000,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":2034000,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearTwo":{"label":"Federal Home Loan Bank, Advances, Maturities Summary, Due in Rolling Year Two","description":"Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":4048000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":257000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1530000,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":590000,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":590000,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":2034000,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, Year One","description":"Amount of advance from Federal Home Loan Bank (FHLBank) maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2011-12-31","val":1298000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"},{"end":"2012-12-31","val":454000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"FederalHomeLoanBankAdvancesShortTerm":{"label":"Federal Home Loan Bank, Advances, Short-term (Deprecated 2014-01-31)","description":"Federal Home Loan Bank borrowings due within one year of the latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":0,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"}]}},"FederalHomeLoanBankBorrowingsFairValueDisclosure":{"label":"Federal Home Loan Bank Borrowings, Fair Value Disclosure","description":"Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).","units":{"USD":[{"end":"2011-12-31","val":40616000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"}]}},"FederalHomeLoanBankStock":{"label":"Federal Home Loan Bank Stock","description":"Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market 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Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"LoansReceivableHeldForSaleAmount":{"label":"Financing Receivable, Held-for-Sale","description":"Amount, before valuation allowance, of financing receivable classified as held-for-sale.","units":{"USD":[{"end":"2013-12-31","val":2200000,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2013Q4I"},{"end":"2015-12-31","val":0,"accn":"0001144204-16-119156","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15"},{"end":"2015-12-31","val":0,"accn":"0001144204-16-134085","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14","frame":"CY2015Q4I"},{"end":"2016-06-30","val":3599000,"accn":"0001144204-16-119156","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15","frame":"CY2016Q2I"},{"end":"2016-09-30","val":755000,"accn":"0001144204-16-134085","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14","frame":"CY2016Q3I"}]}},"LoansReceivableHeldForSaleNet":{"label":"Disposal Group, Including Discontinued Operation, Loans Receivable, Net (Deprecated 2015-01-31)","description":"Amount classified as loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.","units":{"USD":[{"end":"2010-12-31","val":753000,"accn":"0001193125-12-191028","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-04-27","frame":"CY2010Q4I"},{"end":"2010-12-31","val":753000,"accn":"0001193125-12-143623","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"end":"2010-12-31","val":753000,"accn":"0000950123-11-098587","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"end":"2010-12-31","val":753000,"accn":"0000950123-11-077547","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"end":"2011-06-30","val":118000,"accn":"0000950123-11-077547","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15","frame":"CY2011Q2I"},{"end":"2011-09-30","val":63000,"accn":"0000950123-11-098587","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14","frame":"CY2011Q3I"},{"end":"2011-12-31","val":0,"accn":"0001193125-12-191028","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-04-27","frame":"CY2011Q4I"},{"end":"2011-12-31","val":0,"accn":"0001193125-12-143623","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"end":"2013-12-31","val":5597000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"}]}},"LoansReceivableHeldForSaleNetNotPartOfDisposalGroupOther":{"label":"Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Other (Deprecated 2019-01-31)","description":"Amount, after allowance for bad debt, of other loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.","units":{"USD":[{"end":"2015-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":209000,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016Q4I"}]}},"LossContingencyPendingClaimsNumber":{"label":"Loss Contingency, Pending Claims, Number","description":"Number of pending claims pertaining to a loss contingency.","units":{"Claims":[{"end":"2012-12-31","val":0,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}],"pure":[{"end":"2013-12-31","val":0,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24","frame":"CY2015Q4I"}]}},"LossOnSaleOfInvestments":{"label":"Loss on Sale of Investments","description":"The difference between the carrying value and the sale price of an investment. A loss would be recognized when the sale price of the investment is less than the carrying value of the investment. This element refers to the Loss included in earnings and not to the cash proceeds of the sale.","units":{"USD":[{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":141000,"accn":"0001144204-15-018667","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26"},{"start":"2014-01-01","end":"2014-12-31","val":141000,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0001144204-16-089991","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24","frame":"CY2015"}]}},"MarketableSecurities":{"label":"Marketable Securities","description":"Amount of investment in marketable security.","units":{"USD":[{"end":"2010-12-31","val":70910000,"accn":"0001193125-12-191028","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-04-27","frame":"CY2010Q4I"},{"end":"2010-12-31","val":70910000,"accn":"0001193125-12-143623","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"end":"2010-12-31","val":70910000,"accn":"0000950123-11-098587","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"end":"2010-12-31","val":70910000,"accn":"0000950123-11-077547","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"end":"2011-06-30","val":72131000,"accn":"0000950123-11-077547","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15","frame":"CY2011Q2I"},{"end":"2011-09-30","val":85968000,"accn":"0000950123-11-098587","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14","frame":"CY2011Q3I"},{"end":"2011-12-31","val":89123000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"},{"end":"2011-12-31","val":89123000,"accn":"0001193125-12-469929","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"end":"2011-12-31","val":89123000,"accn":"0001193125-12-354659","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":89123000,"accn":"0001193125-12-234110","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-12-31","val":89123000,"accn":"0001193125-12-191028","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-04-27"},{"end":"2011-12-31","val":89123000,"accn":"0001193125-12-143623","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"end":"2012-03-31","val":89883000,"accn":"0001193125-12-234110","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":96131000,"accn":"0001193125-12-354659","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":88727000,"accn":"0001193125-12-469929","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2012Q3I"},{"end":"2012-12-31","val":88346000,"accn":"0001193125-13-218414","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14"},{"end":"2012-12-31","val":88346000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"end":"2012-12-31","val":88346000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2012Q4I"},{"end":"2012-12-31","val":88346000,"accn":"0001144204-13-061810","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14"},{"end":"2012-12-31","val":88346000,"accn":"0001144204-13-045698","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14"},{"end":"2013-03-31","val":85405000,"accn":"0001193125-13-218414","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2013Q1I"},{"end":"2013-06-30","val":87499000,"accn":"0001144204-13-045698","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14","frame":"CY2013Q2I"},{"end":"2013-09-30","val":81071000,"accn":"0001144204-13-061810","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14","frame":"CY2013Q3I"},{"end":"2013-12-31","val":79948000,"accn":"0001144204-14-022677","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-15","frame":"CY2013Q4I"}]}},"MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount":{"label":"Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount (Deprecated 2018-01-31)","description":"This element represents the amount of loss recognized for other than temporary impairments (OTTI) of investments in debt and equity securities.","units":{"USD":[{"start":"2011-01-01","end":"2011-06-30","val":75000,"accn":"0001193125-12-354659","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2011-01-01","end":"2011-09-30","val":75000,"accn":"0001193125-12-469929","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"start":"2011-01-01","end":"2011-12-31","val":75000,"accn":"0001193125-13-136332","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011"}]}},"MinimumLeasePaymentsSaleLeasebackTransactionsWithinOneYear":{"label":"Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months","description":"Amount of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing due in the next fiscal year following the latest fiscal year. 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for Repurchase of Common Stock","description":"The cash outflow to reacquire common stock during the period.","units":{"USD":[{"start":"2015-01-01","end":"2015-06-30","val":0,"accn":"0001144204-16-119156","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15"},{"start":"2015-01-01","end":"2015-09-30","val":0,"accn":"0001144204-16-134085","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2015"},{"start":"2016-01-01","end":"2016-06-30","val":104000,"accn":"0001144204-16-119156","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15"},{"start":"2016-01-01","end":"2016-09-30","val":104000,"accn":"0001144204-16-134085","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14"},{"start":"2016-01-01","end":"2016-12-31","val":104000,"accn":"0001144204-17-017241","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-29","frame":"CY2016"}]}},"PaymentsToAcquireBusinessesGross":{"label":"Payments to Acquire Businesses, Gross","description":"The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition 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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' 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