Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 2,478
Due after one year through five years	16,520
Due after five years through ten years	31,108
Due after ten years	42,946
Amortized Cost	93,052	$ 95,999
Fair Value
Due in one year or less	2,479
Due after one year through five years	15,113
Due after five years through ten years	27,144
Due after ten years	34,407
Total	79,143	83,587
Amortized Cost
Due in one year or less	7,000
Due after one year through five years	119,922
Due after five years through ten years	52,517
Due after ten years	343,738
Amortized Cost	523,177	559,455
Fair Value
Due in one year or less	6,873
Due after one year through five years	110,186
Due after five years through ten years	45,947
Due after ten years	282,646
Total	$ 445,652	$ 494,627