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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":0.0328,"accn":"0000821127-13-000009","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-12","frame":"CY2011Q4I"},{"end":"2012-12-31","val":0.0291,"accn":"0000821127-13-000009","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-12","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.0211,"accn":"0000821127-14-000057","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.0212,"accn":"0000821127-15-000042","fy":2014,"fp":"Q4","form":"10-K","filed":"2015-03-02","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0153,"accn":"0000821127-16-000158","fy":2015,"fp":"Q4","form":"10-K","filed":"2016-02-26","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0.0137,"accn":"0000821127-17-000023","fy":2016,"fp":"Q4","form":"10-K","filed":"2017-02-28","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0.0289,"accn":"0000821127-18-000044","fy":2017,"fp":"Q4","form":"10-K","filed":"2018-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":0.022,"accn":"0000821127-19-000033","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-27","frame":"CY2018Q4I"},{"end":"2019-12-31","val":0.0193,"accn":"0000821127-20-000044","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2019Q4I"},{"end":"2020-12-31","val":0.0325,"accn":"0000821127-21-000029","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-01","frame":"CY2020Q4I"}]}},"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":87079000,"accn":"0000821127-13-000009","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-12","frame":"CY2011Q4I"},{"end":"2012-12-31","val":67994000,"accn":"0000821127-13-000009","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-12","frame":"CY2012Q4I"},{"end":"2013-12-31","val":38129000,"accn":"0000821127-14-000057","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"},{"end":"2014-12-31","val":37989000,"accn":"0000821127-15-000042","fy":2014,"fp":"Q4","form":"10-K","filed":"2015-03-02","frame":"CY2014Q4I"},{"end":"2015-12-31","val":12552000,"accn":"0000821127-16-000158","fy":2015,"fp":"Q4","form":"10-K","filed":"2016-02-26","frame":"CY2015Q4I"},{"end":"2016-12-31","val":9639000,"accn":"0000821127-17-000023","fy":2016,"fp":"Q4","form":"10-K","filed":"2017-02-28","frame":"CY2016Q4I"},{"end":"2017-12-31","val":9548000,"accn":"0000821127-18-000044","fy":2017,"fp":"Q4","form":"10-K","filed":"2018-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":3510000,"accn":"0000821127-19-000033","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-27","frame":"CY2018Q4I"},{"end":"2019-12-31","val":3390000,"accn":"0000821127-20-000044","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2019Q4I"},{"end":"2020-12-31","val":3269000,"accn":"0000821127-21-000029","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-01","frame":"CY2020Q4I"}]}},"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":72479000,"accn":"0000821127-13-000009","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-12","frame":"CY2011Q4I"},{"end":"2012-12-31","val":38855000,"accn":"0000821127-13-000009","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-12","frame":"CY2012Q4I"},{"end":"2013-12-31","val":58206000,"accn":"0000821127-14-000057","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000821127-15-000042","fy":2014,"fp":"Q4","form":"10-K","filed":"2015-03-02","frame":"CY2014Q4I"},{"end":"2015-12-31","val":34365000,"accn":"0000821127-16-000158","fy":2015,"fp":"Q4","form":"10-K","filed":"2016-02-26","frame":"CY2015Q4I"},{"end":"2016-12-31","val":10187000,"accn":"0000821127-17-000023","fy":2016,"fp":"Q4","form":"10-K","filed":"2017-02-28","frame":"CY2016Q4I"},{"end":"2017-12-31","val":3985000,"accn":"0000821127-18-000044","fy":2017,"fp":"Q4","form":"10-K","filed":"2018-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":7370000,"accn":"0000821127-19-000033","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-27","frame":"CY2018Q4I"},{"end":"2019-12-31","val":0,"accn":"0000821127-20-000044","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2019Q4I"},{"end":"2020-12-31","val":0,"accn":"0000821127-21-000029","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-01","frame":"CY2020Q4I"}]}},"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":70199000,"accn":"0000821127-13-000009","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-12","frame":"CY2011Q4I"},{"end":"2012-12-31","val":35708000,"accn":"0000821127-13-000009","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-12","frame":"CY2012Q4I"},{"end":"2013-12-31","val":91742000,"accn":"0000821127-14-000057","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"},{"end":"2014-12-31","val":111837000,"accn":"0000821127-15-000042","fy":2014,"fp":"Q4","form":"10-K","filed":"2015-03-02","frame":"CY2014Q4I"},{"end":"2015-12-31","val":100271000,"accn":"0000821127-16-000158","fy":2015,"fp":"Q4","form":"10-K","filed":"2016-02-26","frame":"CY2015Q4I"},{"end":"2016-12-31","val":129850000,"accn":"0000821127-17-000023","fy":2016,"fp":"Q4","form":"10-K","filed":"2017-02-28","frame":"CY2016Q4I"},{"end":"2017-12-31","val":59018000,"accn":"0000821127-18-000044","fy":2017,"fp":"Q4","form":"10-K","filed":"2018-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":99365000,"accn":"0000821127-19-000033","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-27","frame":"CY2018Q4I"},{"end":"2019-12-31","val":61740000,"accn":"0000821127-20-000044","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2019Q4I"},{"end":"2020-12-31","val":3985000,"accn":"0000821127-21-000029","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-01","frame":"CY2020Q4I"}]}},"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. 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from Divestiture of Businesses and Interests in Affiliates","description":"The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).","units":{"USD":[{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000821127-19-000033","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-27","frame":"CY2017"},{"start":"2018-01-01","end":"2018-12-31","val":52981000,"accn":"0000821127-19-000033","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-27","frame":"CY2018"}]}},"ProceedsFromDivestitureOfBusinessesNetOfCashDivested":{"label":"Proceeds from Divestiture of Businesses, Net of Cash Divested","description":"This element represents the cash inflow during the period from the sale of a component of the 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Alternate caption for the concept is permanent 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