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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":0.0506,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.0506,"accn":"0001140361-14-012702","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.05057,"accn":"0001140361-15-011684","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0506,"accn":"0000745981-16-000082","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0.03412,"accn":"0000745981-17-000035","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0.0199,"accn":"0000745981-18-000058","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-16","frame":"CY2017Q4I"}]}},"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":0.0506,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.0506,"accn":"0001140361-14-012702","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.05057,"accn":"0001140361-15-011684","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0341,"accn":"0000745981-16-000082","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"}]}},"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":0.0506,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.0341,"accn":"0001140361-14-012702","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2015-12-31","val":0.0199,"accn":"0000745981-16-000082","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"}]}},"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":0.0506,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.0506,"accn":"0001140361-14-012702","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.03412,"accn":"0001140361-15-011684","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2014Q4I"},{"end":"2016-12-31","val":0.01985,"accn":"0000745981-17-000035","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16","frame":"CY2016Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, Year Five","description":"Amount of advance from Federal Home Loan Bank (FHLBank) maturing 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":{"USD":[{"end":"2012-12-31","val":16738000,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2014-12-31","val":10021000,"accn":"0001140361-15-011684","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2014Q4I"}]}},"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":"2012-12-31","val":65000,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-12-31","val":426000,"accn":"0001140361-14-012702","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":427000,"accn":"0001140361-15-011684","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2014Q4I"},{"end":"2015-12-31","val":15403000,"accn":"0000745981-16-000082","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"}]}},"FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate":{"label":"Federal Home Loan Bank, Advance, Maturity, Year Four","description":"Amount of advance from Federal Home Loan Bank (FHLBank) maturing 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":{"USD":[{"end":"2012-12-31","val":77000,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-12-31","val":15403000,"accn":"0001140361-14-012702","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2015-12-31","val":10021000,"accn":"0000745981-16-000082","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"}]}},"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":"2012-12-31","val":71000,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-12-31","val":427000,"accn":"0001140361-14-012702","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":15403000,"accn":"0001140361-15-011684","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2014Q4I"},{"end":"2016-12-31","val":10021000,"accn":"0000745981-17-000035","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16","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":"2012-12-31","val":59000,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-12-31","val":426000,"accn":"0001140361-14-012702","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14"},{"end":"2013-12-31","val":25000000,"accn":"0001140361-14-031436","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"end":"2013-12-31","val":25000000,"accn":"0001140361-14-040643","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07","frame":"CY2013Q4I"},{"end":"2014-06-30","val":35000000,"accn":"0001140361-14-031436","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08","frame":"CY2014Q2I"},{"end":"2014-09-30","val":35000000,"accn":"0001140361-14-040643","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07","frame":"CY2014Q3I"},{"end":"2014-12-31","val":426000,"accn":"0001140361-15-011684","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2014Q4I"},{"end":"2015-12-31","val":427000,"accn":"0000745981-16-000082","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":15403000,"accn":"0000745981-17-000035","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16","frame":"CY2016Q4I"}]}},"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":"0001140361-14-012702","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2012Q4I"},{"end":"2012-12-31","val":27128000,"accn":"0001140361-13-031373","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09"},{"end":"2013-06-30","val":51916000,"accn":"0001140361-13-031373","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09","frame":"CY2013Q2I"},{"end":"2013-12-31","val":25000000,"accn":"0001140361-14-019888","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09","frame":"CY2013Q4I"},{"end":"2013-12-31","val":25000000,"accn":"0001140361-14-012702","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14"},{"end":"2014-03-31","val":25000000,"accn":"0001140361-14-019888","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09","frame":"CY2014Q1I"}]}},"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 (liquidity).","units":{"USD":[{"end":"2011-12-31","val":586000,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2011-12-31","val":586000,"accn":"0001140361-12-046395","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"end":"2011-12-31","val":586000,"accn":"0001140361-12-035994","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"end":"2012-06-30","val":587000,"accn":"0001140361-12-035994","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-09-30","val":588000,"accn":"0001140361-12-046395","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2012-12-31","val":1862000,"accn":"0001140361-13-041204","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08","frame":"CY2012Q4I"},{"end":"2012-12-31","val":1862000,"accn":"0001140361-13-031373","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09"},{"end":"2012-12-31","val":1862000,"accn":"0001140361-13-020022","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":1862000,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"end":"2013-03-31","val":1863000,"accn":"0001140361-13-020022","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":2803000,"accn":"0001140361-13-031373","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09","frame":"CY2013Q2I"},{"end":"2013-09-30","val":2804000,"accn":"0001140361-13-041204","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08","frame":"CY2013Q3I"}]}},"FederalReserveBankStock":{"label":"Federal Reserve Bank Stock","description":"Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).","units":{"USD":[{"end":"2011-12-31","val":2071000,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2011-12-31","val":2071000,"accn":"0001140361-12-046395","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"end":"2011-12-31","val":2071000,"accn":"0001140361-12-035994","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"end":"2012-06-30","val":2255000,"accn":"0001140361-12-035994","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-09-30","val":2255000,"accn":"0001140361-12-046395","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2012-12-31","val":2258000,"accn":"0001140361-13-041204","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08","frame":"CY2012Q4I"},{"end":"2012-12-31","val":2258000,"accn":"0001140361-13-031373","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09"},{"end":"2012-12-31","val":2258000,"accn":"0001140361-13-020022","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":2258000,"accn":"0001140361-13-012927","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"end":"2013-03-31","val":3789000,"accn":"0001140361-13-020022","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":3788000,"accn":"0001140361-13-031373","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09","frame":"CY2013Q2I"},{"end":"2013-09-30","val":3789000,"accn":"0001140361-13-041204","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08","frame":"CY2013Q3I"}]}},"FeesAndCommissionsDepositorAccounts":{"label":"Fees and Commissions, Depositor Accounts (Deprecated 2018-01-31)","description":"Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. 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