Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investment Securities [Abstract]
Available for sale, Amortized Cost, Due after one year through five years	$ 799
Available for sale, Amortized Cost, Due after five years through ten years	51,665
Available for sale, Amortized Cost, Due after ten years	52,347
Available-for-sale securities, Amortized Cost	104,811	$ 137,465
Available for sale, Estimated Fair Value, Due after one year through five years	825
Available for sale, Estimated Fair Value, Due after five years through ten years	52,410
Available for sale, Estimated Fair Value, Due after ten years	51,890
Available-for-sale Securities, Debt Securities, Total	105,125	139,568
Held to maturity securities, Amortized Cost, Due in one year or less	2,921
Held to maturity securities, Amortized Cost, Due after one year through five years	9,982
Held to maturity securities, Amortized Cost, Due after five years through ten years	55,874
Held to maturity securities, Amortized Cost, Due after ten years	181,724
Held-to-maturity Securities, Amortized Cost	250,501	65,706
Held to maturity securities, Estimated Fair Value, Due in one year or less	2,954
Held to maturity securities, Estimated Fair Value, Due after one year through five years	9,959
Held to maturity securities, Estimated Fair Value, Due after five years through ten years	55,560
Held to maturity securities, Estimated Fair Value, Due after ten years	179,362
Held-to-maturity Securities, Fair Value, Total	$ 247,835	$ 65,828