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This relates to loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.","units":{"USD":[{"start":"2015-01-01","end":"2015-06-30","val":0,"accn":"0001193125-15-291527","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2015-01-01","end":"2015-09-30","val":0,"accn":"0001193125-15-377172","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0001606440-19-000004","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-08","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":0,"accn":"0001606440-18-000009","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-06","frame":"CY2017Q1"},{"start":"2017-04-01","end":"2017-06-30","val":0,"accn":"0001606440-18-000007","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09","frame":"CY2017Q2"},{"start":"2017-07-01","end":"2017-09-30","val":0,"accn":"0001606440-18-000009","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-06","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0001606440-19-000004","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-08"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0001606440-20-000002","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-13","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":46000,"accn":"0001606440-18-000009","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-06"},{"start":"2018-01-01","end":"2018-03-31","val":0,"accn":"0001606440-19-000008","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-07"},{"start":"2018-01-01","end":"2018-03-31","val":0,"accn":"0001606440-19-000012","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-06"},{"start":"2018-01-01","end":"2018-03-31","val":151000,"accn":"0001606440-19-000024","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-05","frame":"CY2018Q1"},{"start":"2018-04-01","end":"2018-06-30","val":67000,"accn":"0001606440-18-000007","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"start":"2018-04-01","end":"2018-06-30","val":0,"accn":"0001606440-19-000012","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-06","frame":"CY2018Q2"},{"start":"2018-07-01","end":"2018-09-30","val":74000,"accn":"0001606440-18-000009","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-06","frame":"CY2018Q3"},{"start":"2018-01-01","end":"2018-12-31","val":104000,"accn":"0001606440-19-000004","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-08"},{"start":"2018-01-01","end":"2018-12-31","val":104000,"accn":"0001606440-20-000002","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-13","frame":"CY2018"},{"start":"2019-01-01","end":"2019-03-31","val":0,"accn":"0001606440-19-000008","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-07"},{"start":"2019-01-01","end":"2019-03-31","val":0,"accn":"0001606440-19-000012","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-06"},{"start":"2019-01-01","end":"2019-03-31","val":7000,"accn":"0001606440-19-000024","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-05"},{"start":"2019-01-01","end":"2019-03-31","val":0,"accn":"0001606440-20-000004","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-08","frame":"CY2019Q1"},{"start":"2019-01-01","end":"2019-06-30","val":7000,"accn":"0001606440-20-000007","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-07"},{"start":"2019-04-01","end":"2019-06-30","val":7000,"accn":"0001606440-19-000012","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-06","frame":"CY2019Q2"},{"start":"2019-01-01","end":"2019-09-30","val":12000,"accn":"0001606440-20-000010","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-05"},{"start":"2019-01-01","end":"2019-12-31","val":12000,"accn":"0001606440-20-000002","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-13","frame":"CY2019"},{"start":"2020-01-01","end":"2020-03-31","val":20000,"accn":"0001606440-20-000004","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-08","frame":"CY2020Q1"},{"start":"2020-01-01","end":"2020-06-30","val":80000,"accn":"0001606440-20-000007","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-07"},{"start":"2020-01-01","end":"2020-09-30","val":137000,"accn":"0001606440-20-000010","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-05"}]}},"CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference":{"label":"Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference","description":"Change in the estimate of cash flows expected to be collected, after acquisition of a loan, which results in an increase in accretable yield (for example, if actual cash flows are significantly greater than previously expected). 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This relates to loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments 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(FHLB).","units":{"USD":[{"end":"2014-12-31","val":6502000,"accn":"0001193125-16-519853","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-28","frame":"CY2014Q4I"},{"end":"2015-12-31","val":23214000,"accn":"0001193125-16-519853","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-28"},{"end":"2015-12-31","val":23214000,"accn":"0001193125-17-082187","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14","frame":"CY2015Q4I"},{"end":"2016-12-31","val":30484000,"accn":"0001193125-17-082187","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14"},{"end":"2016-12-31","val":30484000,"accn":"0001437749-18-004838","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":5924000,"accn":"0001437749-18-004838","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-16"},{"end":"2017-12-31","val":5924000,"accn":"0001606440-19-000004","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-08","frame":"CY2017Q4I"},{"end":"2018-12-31","val":96082000,"accn":"0001606440-19-000004","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-08"},{"end":"2018-12-31","val":96082000,"accn":"0001606440-20-000002","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-13","frame":"CY2018Q4I"},{"end":"2019-12-31","val":159379000,"accn":"0001606440-20-000002","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-13"},{"end":"2019-12-31","val":159379000,"accn":"0001606440-21-000005","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-09","frame":"CY2019Q4I"},{"end":"2020-12-31","val":349138000,"accn":"0001606440-21-000005","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-09","frame":"CY2020Q4I"}]}},"FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1":{"label":"Federal 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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":"2019-12-31","val":0.0122,"accn":"0001606440-21-000005","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-09","frame":"CY2019Q4I"},{"end":"2020-12-31","val":0,"accn":"0001606440-21-000005","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-09","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. 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