Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Investment Securities [Abstract]
Available for sale, Amortized Cost, Due in one year or less	$ 71
Available for sale, Amortized Cost, Due after one year through five years	2,137
Available for sale, Amortized Cost, Due after five years through ten years	55,374
Available for sale, Amortized Cost, Due after ten years	52,102
Available-for-sale securities, Amortized Cost	109,684	$ 116,906
Available for sale, Estimated Fair Value, Due in one year or less	72
Available for sale, Estimated Fair Value, Due after one year through five years	2,149
Available for sale, Estimated Fair Value, Due after five years through ten years	54,351
Available for sale, Estimated Fair Value, Due after ten years	50,123
Available-for-sale Securities, Debt Securities, Total	106,695	116,982
Held to maturity securities, Amortized Cost, Due in one year or less	3,924
Held to maturity securities, Amortized Cost, Due after one year through five years	22,537
Held to maturity securities, Amortized Cost, Due after five years through ten years	91,202
Held to maturity securities, Amortized Cost, Due after ten years	289,475
Held-to-maturity Securities, Amortized Cost	407,138	404,594
Held to maturity securities, Estimated Fair Value, Due in one year or less	3,930
Held to maturity securities, Estimated Fair Value, Due after one year through five years	22,016
Held to maturity securities, Estimated Fair Value, Due after five years through ten years	88,810
Held to maturity securities, Estimated Fair Value, Due after ten years	275,785
Held-to-maturity Securities, Fair Value, Total	$ 390,541	$ 401,524