Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investment Securities [Abstract]
Available for sale, Amortized Cost, Due after one year through five years	$ 1,174
Available for sale, Amortized Cost, Due after five years through ten years	57,863
Available for sale, Amortized Cost, Due after ten years	64,038
Available-for-sale securities, Amortized Cost	123,075	$ 137,465
Available for sale, Estimated Fair Value, Due after one year through five years	1,214
Available for sale, Estimated Fair Value, Due after five years through ten years	59,015
Available for sale, Estimated Fair Value, Due after ten years	63,874
Available-for-sale Securities, Debt Securities, Total	124,103	139,568
Held to maturity securities, Amortized Cost, Due after one year through five years	7,919
Held to maturity securities, Amortized Cost, Due after five years through ten years	37,492
Held to maturity securities, Amortized Cost, Due after ten years	80,518
Held-to-maturity Securities, Amortized Cost	125,929	65,706
Held to maturity securities, Estimated Fair Value, Due after one year through five years	7,968
Held to maturity securities, Estimated Fair Value, Due after five years through ten years	37,403
Held to maturity securities, Estimated Fair Value, Due after ten years	79,705
Held-to-maturity Securities, Fair Value, Total	$ 125,076	$ 65,828