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Advances are loans from the federal home loan bank system to a member (shareholder).","units":{"USD":[{"end":"2012-12-31","val":703000,"accn":"0000914317-13-000408","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-29","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":0.005,"accn":"0000914317-13-000408","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-29","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.005,"accn":"0000914317-14-000365","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-18","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.005,"accn":"0001174947-15-000464","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-18","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.005,"accn":"0001174947-16-002264","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-16","frame":"CY2015Q4I"}]}},"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. 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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":"2013-12-31","val":0.005,"accn":"0000914317-14-000365","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-18","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.005,"accn":"0001174947-15-000464","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-18","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.005,"accn":"0001174947-16-002264","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-16","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":"2012-12-31","val":0.005,"accn":"0000914317-13-000408","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-29","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.005,"accn":"0000914317-14-000365","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-18","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.005,"accn":"0001174947-15-000464","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-18","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.005,"accn":"0001174947-16-002264","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-16","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. 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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":25000,"accn":"0000914317-13-000408","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-29","frame":"CY2012Q4I"},{"end":"2013-12-31","val":26000,"accn":"0000914317-14-000365","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-18","frame":"CY2013Q4I"},{"end":"2014-12-31","val":27000,"accn":"0001174947-15-000464","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-18","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":23000,"accn":"0000914317-13-000408","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-29","frame":"CY2012Q4I"},{"end":"2013-12-31","val":24000,"accn":"0000914317-14-000365","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-18","frame":"CY2013Q4I"},{"end":"2014-12-31","val":24000,"accn":"0001174947-15-000464","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-18","frame":"CY2014Q4I"},{"end":"2015-12-31","val":25000,"accn":"0001174947-16-002264","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-16","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":24000,"accn":"0000914317-13-000408","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-29","frame":"CY2012Q4I"},{"end":"2013-12-31","val":25000,"accn":"0000914317-14-000365","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-18","frame":"CY2013Q4I"},{"end":"2014-12-31","val":26000,"accn":"0001174947-15-000464","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-18","frame":"CY2014Q4I"},{"end":"2015-12-31","val":27000,"accn":"0001174947-16-002264","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-16","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. 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