Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 51,911
Due after one year through five years	16,189
Due after five years through ten years	42,049
Due after ten years	80,434
Amortized Cost	190,583	$ 120,832
Fair Value
Due in one year or less	51,915
Due after one year through five years	15,075
Due after five years through ten years	39,399
Due after ten years	73,107
Total	179,496	110,521
Amortized Cost
Due in one year or less	7,000
Due after one year through five years	129,497
Due after five years through ten years	39,125
Due after ten years	328,316
Amortized Cost	503,938	513,282
Fair Value
Due in one year or less	6,947
Due after one year through five years	121,031
Due after five years through ten years	35,652
Due after ten years	280,628
Total	$ 444,258	$ 457,830