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Held-to-Maturity Securities Schedule Of Derivative Instruments Notional And Fair Values Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Basic Earnings Per Share, Basic Insider Trading Arrangements [Line Items] Plus 5-year Treasury rate Plus 5-year Treasury rate [Member] Plus 5-year Treasury rate Short-term Borrowings Short-Term Debt, Fair Value us-gaap_ScheduleOfAssumptionsForFairValueAsOfBalanceSheetDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrServicingLiabilities(Commercial Mortgage)TextBlock us-gaap_ScheduleOfAssumptionsForFairValueAsOfBalanceSheetDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrServicingLiabilities(Commercial Mortgage)TextBlock [Table Text Block] us-gaap_ScheduleOfAssumptionsForFairValueAsOfBalanceSheetDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrServicingLiabilities(Commercial Mortgage)TextBlock Excess of Redemption Amount Over Carrying Amount 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