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Securities (Investments Classified by Contractual Maturity Date) (Details) - Asset-backed securities issued by GSEs - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Available for Sale, Amortized Cost [Abstract]    
Within one year $ 36,859 $ 36,165
Over one year through five years 121,308 60,669
Over five years through ten years 191,166 67,158
After ten years 151,145 76,021
Total AFS securities 500,478 240,013
Available for Sale, Estimated Fair Value [Abstract]    
Within one year 36,665 37,084
Over one year through five years 120,668 62,209
Over five years through ten years 190,158 68,862
After ten years 150,348 77,950
Total AFS securities $ 497,839 $ 246,105