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This item includes treasury stock repurchased by the entity. 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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":"2011-12-31","val":0,"accn":"0000914317-13-000390","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":0.0164,"accn":"0000914317-13-000390","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2012-12-31","val":0.0164,"accn":"0000914317-14-000403","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.0116,"accn":"0000914317-14-000403","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26"},{"end":"2013-12-31","val":0.0116,"accn":"0001174947-15-000527","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.0335,"accn":"0001174947-15-000527","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27"},{"end":"2014-12-31","val":0.0335,"accn":"0001174947-16-002333","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0001023860-17-000013","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-22","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0001023860-17-000013","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-22"},{"end":"2016-12-31","val":0,"accn":"0001023860-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-23","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0.0168,"accn":"0001023860-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-23"},{"end":"2017-12-31","val":0.0168,"accn":"0001023860-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2017Q4I"},{"end":"2018-12-31","val":0,"accn":"0001023860-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2018Q4I"}]}},"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":"2011-12-31","val":0.0172,"accn":"0000914317-13-000390","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":0,"accn":"0000914317-13-000390","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.0164,"accn":"0000914317-14-000403","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26"},{"end":"2013-12-31","val":0.0164,"accn":"0001174947-15-000527","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.0374,"accn":"0001174947-15-000527","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27"},{"end":"2014-12-31","val":0.0374,"accn":"0001174947-16-002333","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0335,"accn":"0001174947-16-002333","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":0.0173,"accn":"0001023860-17-000013","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-22","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0.0186,"accn":"0001023860-17-000013","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-22"},{"end":"2016-12-31","val":0.0186,"accn":"0001023860-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-23","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0.0188,"accn":"0001023860-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-23"},{"end":"2017-12-31","val":0.0188,"accn":"0001023860-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2017Q4I"},{"end":"2018-12-31","val":0.0168,"accn":"0001023860-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2018Q4I"}]}},"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":10000000,"accn":"0000914317-13-000390","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":10000000,"accn":"0000914317-14-000403","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26","frame":"CY2012Q4I"},{"end":"2012-12-31","val":10000000,"accn":"0000914317-13-000390","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"}]}},"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":"2011-12-31","val":10000000,"accn":"0000914317-13-000390","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":5000000,"accn":"0000914317-13-000390","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2012-12-31","val":5000000,"accn":"0000914317-14-000403","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":10000000,"accn":"0000914317-14-000403","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26"},{"end":"2013-12-31","val":10000000,"accn":"0001174947-15-000527","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27","frame":"CY2013Q4I"},{"end":"2015-12-31","val":0,"accn":"0001023860-17-000013","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-22","frame":"CY2015Q4I"},{"end":"2016-12-31","val":5000000,"accn":"0001023860-17-000013","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-22"},{"end":"2016-12-31","val":5000000,"accn":"0001023860-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-23","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0001023860-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-23"},{"end":"2017-12-31","val":0,"accn":"0001023860-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2017Q4I"},{"end":"2018-12-31","val":10000000,"accn":"0001023860-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2018Q4I"}]}},"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":"2014-12-31","val":10000000,"accn":"0001174947-15-000527","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27"},{"end":"2014-12-31","val":10000000,"accn":"0001174947-16-002333","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":15000000,"accn":"0001174947-16-002333","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":15000000,"accn":"0001023860-17-000013","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-22","frame":"CY2015Q4I"},{"end":"2016-12-31","val":15000000,"accn":"0001023860-17-000013","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-22"},{"end":"2016-12-31","val":15000000,"accn":"0001023860-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-23","frame":"CY2016Q4I"},{"end":"2017-12-31","val":33000000,"accn":"0001023860-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-23"},{"end":"2017-12-31","val":33000000,"accn":"0001023860-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2017Q4I"},{"end":"2018-12-31","val":5000000,"accn":"0001023860-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2018Q4I"}]}},"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":10000000,"accn":"0000914317-13-000390","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2012-12-31","val":10000000,"accn":"0000914317-14-000403","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":5000000,"accn":"0000914317-14-000403","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26"},{"end":"2013-12-31","val":5000000,"accn":"0001174947-15-000527","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":15000000,"accn":"0001174947-15-000527","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27"},{"end":"2014-12-31","val":15000000,"accn":"0001174947-16-002333","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0001023860-17-000013","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-22","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0001023860-17-000013","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-22"},{"end":"2016-12-31","val":0,"accn":"0001023860-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-23","frame":"CY2016Q4I"},{"end":"2017-12-31","val":5000000,"accn":"0001023860-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-23"},{"end":"2017-12-31","val":5000000,"accn":"0001023860-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2017Q4I"},{"end":"2018-12-31","val":0,"accn":"0001023860-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2018Q4I"}]}},"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. 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ases":{"label":"Payments 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