Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Investment Securities [Abstract]
Available for sale, Amortized Cost, Due in one year or less	$ 30
Available for sale, Amortized Cost, Due after one year through five years	8,771
Available for sale, Amortized Cost, Due after five years through ten years	36,753
Available for sale, Amortized Cost, Due after ten years	44,292
Available-for-sale securities, Amortized Cost	89,846	$ 95,999
Available for sale, Estimated Fair Value, Due in one year or less	30
Available for sale, Estimated Fair Value, Due after one year through five years	8,345
Available for sale, Estimated Fair Value, Due after five years through ten years	32,325
Available for sale, Estimated Fair Value, Due after ten years	37,369
Available-for-sale Securities, Debt Securities, Total	78,069	83,587
Held to maturity securities, Amortized Cost, Due in one year or less	1,019
Held to maturity securities, Amortized Cost, Due after one year through five years	123,636
Held to maturity securities, Amortized Cost, Due after five years through ten years	58,643
Held to maturity securities, Amortized Cost, Due after ten years	353,835
Held-to-maturity Securities, Amortized Cost	537,133	559,455
Held to maturity securities, Estimated Fair Value, Due in one year or less	1,009
Held to maturity securities, Estimated Fair Value, Due after one year through five years	114,964
Held to maturity securities, Estimated Fair Value, Due after five years through ten years	52,809
Held to maturity securities, Estimated Fair Value, Due after ten years	304,514
Held-to-maturity Securities, Fair Value, Total	$ 473,296	$ 494,627	$ 494,627