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Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.","units":{"USD":[{"end":"2014-12-31","val":0,"accn":"0001193125-16-510486","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-18","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0001193125-16-510486","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-18"},{"end":"2015-12-31","val":0,"accn":"0001193125-17-095652","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-24","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0001193125-17-095652","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-24","frame":"CY2016Q4I"}]}},"LineOfCreditFacilityMaximumBorrowingCapacity":{"label":"Line of Credit Facility, Maximum Borrowing Capacity","description":"Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.","units":{"USD":[{"end":"2014-12-31","val":6000000,"accn":"0001193125-16-510486","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-18","frame":"CY2014Q4I"},{"end":"2015-12-31","val":25500000,"accn":"0001193125-16-510486","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-18"},{"end":"2015-12-31","val":25500000,"accn":"0001193125-17-095652","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-24","frame":"CY2015Q4I"},{"end":"2016-12-31","val":25500000,"accn":"0001193125-17-095652","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-24","frame":"CY2016Q4I"}]}},"LoansAndLeasesReceivableDeferredIncome":{"label":"Loans and Leases Receivable, Deferred Income","description":"Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. 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Excludes loans and leases covered under loss sharing agreements.","units":{"USD":[{"end":"2013-12-31","val":113388000,"accn":"0001193125-14-253160","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-06-27"},{"end":"2013-12-31","val":113388000,"accn":"0001193125-14-307740","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13"},{"end":"2013-12-31","val":113388000,"accn":"0001193125-14-410496","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-13"},{"end":"2013-12-31","val":113388000,"accn":"0001193125-15-109402","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27","frame":"CY2013Q4I"},{"end":"2014-03-31","val":111978000,"accn":"0001193125-14-253160","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-06-27","frame":"CY2014Q1I"},{"end":"2014-06-30","val":110406000,"accn":"0001193125-14-307740","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13","frame":"CY2014Q2I"},{"end":"2014-09-30","val":113097000,"accn":"0001193125-14-410496","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-13","frame":"CY2014Q3I"},{"end":"2014-12-31","val":110619000,"accn":"0001193125-15-109402","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27"},{"end":"2014-12-31","val":110619000,"accn":"0001193125-15-184190","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-12"},{"end":"2014-12-31","val":110619000,"accn":"0001193125-15-290083","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-13"},{"end":"2014-12-31","val":110619000,"accn":"0001193125-15-375880","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":110516000,"accn":"0001193125-16-510486","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-18","frame":"CY2014Q4I"},{"end":"2015-03-31","val":120786000,"accn":"0001193125-15-184190","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-12","frame":"CY2015Q1I"},{"end":"2015-06-30","val":309372000,"accn":"0001193125-15-290083","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-13","frame":"CY2015Q2I"},{"end":"2015-09-30","val":322915000,"accn":"0001193125-15-375880","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":329073000,"accn":"0001193125-16-510486","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-18"},{"end":"2015-12-31","val":329073000,"accn":"0001193125-16-581006","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06"},{"end":"2015-12-31","val":329073000,"accn":"0001193125-16-680732","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-12"},{"end":"2015-12-31","val":329073000,"accn":"0001193125-16-767112","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14"},{"end":"2015-12-31","val":329073000,"accn":"0001193125-17-095652","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-24","frame":"CY2015Q4I"},{"end":"2016-03-31","val":340719000,"accn":"0001193125-16-581006","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06","frame":"CY2016Q1I"},{"end":"2016-06-30","val":374871000,"accn":"0001193125-16-680732","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-12","frame":"CY2016Q2I"},{"end":"2016-09-30","val":399191000,"accn":"0001193125-16-767112","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14","frame":"CY2016Q3I"},{"end":"2016-12-31","val":687189000,"accn":"0001193125-17-095652","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-24"},{"end":"2016-12-31","val":687189000,"accn":"0001193125-17-169476","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15"},{"end":"2016-12-31","val":687189000,"accn":"0001193125-17-254431","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":687189000,"accn":"0001193125-17-338455","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q4I"},{"end":"2017-03-31","val":693488000,"accn":"0001193125-17-169476","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2017Q1I"},{"end":"2017-06-30","val":707774000,"accn":"0001193125-17-254431","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":705457000,"accn":"0001193125-17-338455","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"}]}},"LoansAndLeasesReceivableLoansInProcess":{"label":"Loans and Leases Receivable, Loans in Process","description":"Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements.","units":{"USD":[{"end":"2013-12-31","val":260000,"accn":"0001193125-14-253160","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-06-27"},{"end":"2013-12-31","val":260000,"accn":"0001193125-14-307740","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13"},{"end":"2013-12-31","val":260000,"accn":"0001193125-14-410496","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-13"},{"end":"2013-12-31","val":260000,"accn":"0001193125-15-109402","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27","frame":"CY2013Q4I"},{"end":"2014-03-31","val":185000,"accn":"0001193125-14-253160","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-06-27","frame":"CY2014Q1I"},{"end":"2014-06-30","val":116000,"accn":"0001193125-14-307740","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13","frame":"CY2014Q2I"},{"end":"2014-09-30","val":229000,"accn":"0001193125-14-410496","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-13","frame":"CY2014Q3I"},{"end":"2014-12-31","val":103000,"accn":"0001193125-15-109402","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-27"},{"end":"2014-12-31","val":103000,"accn":"0001193125-15-184190","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-12"},{"end":"2014-12-31","val":103000,"accn":"0001193125-15-290083","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-13"},{"end":"2014-12-31","val":103000,"accn":"0001193125-15-375880","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q4I"},{"end":"2015-03-31","val":184000,"accn":"0001193125-15-184190","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-12","frame":"CY2015Q1I"},{"end":"2015-06-30","val":167000,"accn":"0001193125-15-290083","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-13","frame":"CY2015Q2I"},{"end":"2015-09-30","val":271000,"accn":"0001193125-15-375880","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"}]}},"LoansAndLeasesReceivableNetReportedAmount":{"label":"Loans and Leases Receivable, Net Amount","description":"Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for 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