Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investment Securities [Abstract]
Available for sale, Amortized Cost, Due in one year or less	$ 46
Available for sale, Amortized Cost, Due after one year through five years	7,004
Available for sale, Amortized Cost, Due after five years through ten years	40,359
Available for sale, Amortized Cost, Due after ten years	45,345
Available-for-sale securities, Amortized Cost	92,754	$ 95,999
Available for sale, Estimated Fair Value, Due in one year or less	46
Available for sale, Estimated Fair Value, Due after one year through five years	6,733
Available for sale, Estimated Fair Value, Due after five years through ten years	36,068
Available for sale, Estimated Fair Value, Due after ten years	38,678
Available-for-sale Securities, Debt Securities, Total	81,525	83,587
Held to maturity securities, Amortized Cost, Due in one year or less	1,061
Held to maturity securities, Amortized Cost, Due after one year through five years	118,384
Held to maturity securities, Amortized Cost, Due after five years through ten years	65,244
Held to maturity securities, Amortized Cost, Due after ten years	364,407
Held-to-maturity Securities, Amortized Cost	549,096	559,455
Held to maturity securities, Estimated Fair Value, Due in one year or less	1,042
Held to maturity securities, Estimated Fair Value, Due after one year through five years	111,443
Held to maturity securities, Estimated Fair Value, Due after five years through ten years	59,798
Held to maturity securities, Estimated Fair Value, Due after ten years	318,833
Held-to-maturity Securities, Fair Value, Total	$ 491,116	$ 494,627