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of Deposit, at Carrying Value","description":"A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. 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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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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"pure":[{"end":"2014-12-31","val":0.0294,"accn":"0000750686-15-000019","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-10","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0192,"accn":"0000750686-16-000254","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"}]}},"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":"2014-12-31","val":0.0192,"accn":"0000750686-15-000019","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-10","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0403,"accn":"0000750686-16-000254","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","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":"2014-12-31","val":0.0403,"accn":"0000750686-15-000019","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-10","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0187,"accn":"0000750686-16-000254","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"}]}},"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":20000000,"accn":"0001144204-13-012090","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011Q4I"}]}},"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":30000000,"accn":"0001144204-13-012090","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":20000000,"accn":"0001144204-13-012090","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"end":"2012-12-31","val":20000000,"accn":"0000750686-14-000047","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-12","frame":"CY2012Q4I"}]}},"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":5523000,"accn":"0001144204-13-012090","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011Q4I"},{"end":"2013-12-31","val":11112000,"accn":"0000750686-14-000047","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-12"},{"end":"2013-12-31","val":25000000,"accn":"0000750686-15-000019","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-10","frame":"CY2013Q4I"},{"end":"2014-12-31","val":25000000,"accn":"0000750686-15-000019","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-10","frame":"CY2014Q4I"},{"end":"2015-12-31","val":20000000,"accn":"0000750686-16-000254","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"},{"end":"2018-12-31","val":10000000,"accn":"0000750686-19-000052","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-13"},{"end":"2018-12-31","val":10000000,"accn":"0000750686-20-000044","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-11","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":"2011-12-31","val":16247000,"accn":"0001144204-13-012090","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":25000000,"accn":"0001144204-13-012090","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"end":"2012-12-31","val":25000000,"accn":"0000750686-14-000047","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-12","frame":"CY2012Q4I"},{"end":"2013-12-31","val":20000000,"accn":"0000750686-14-000047","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-12","frame":"CY2013Q4I"}]}},"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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