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Securities (Investments Classified by Contractual Maturity Date) (Details) - Asset-backed securities issued by GSEs [Member]
$ in Thousands
Dec. 31, 2019
USD ($)
Debt and Equity Securities, FV-NI [Line Items]  
Amortized cost, available for sale, within one year $ 41,949
Amortized cost, available for sale, over one year through five years 80,043
Amortized cost, available for sale, over five years through ten years 66,972
Amortized cost, available for sale, after ten years 17,149
Amortized cost, available for sale, total 206,113
Estimated fair value, available for sale, within one year 42,358
Estimated fair value, available for sale, over one year through five years 80,855
Estimated fair value, available for sale, over five years through ten years 67,651
Estimated fair value, available for sale, after ten years 17,323
Estimated fair value, available for sale, total $ 208,187