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Securities (Investments Classified by Contractual Maturity Date) (Details) - Asset-backed securities issued by GSEs
$ in Thousands
Dec. 31, 2020
USD ($)
Available for Sale, Amortized Cost [Abstract]  
Within one year $ 36,165
Over one year through five years 60,669
Over five years through ten years 67,158
After ten years 76,021
Total AFS securities 240,013
Available for Sale, Estimated Fair Value [Abstract]  
Within one year 37,084
Over one year through five years 62,209
Over five years through ten years 68,862
After ten years 77,950
Total AFS securities $ 246,105