Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale securities:
Amortized Cost	$ 120,832	$ 95,999
Gross Unrealized Gains	69	7
Gross Unrealized Losses	10,380	12,419
Investment securities - AFS	110,521	83,587
Held-to-maturity securities:
Amortized Cost	513,282	559,455
Gross Unrealized Gains	57	35
Gross Unrealized Losses	55,509	64,863
Estimated Fair Value	457,830	494,627
U.S. Treasury and government agencies
Available-for-sale securities:
Amortized Cost	23,472	21,798
Gross Unrealized Gains	5	5
Gross Unrealized Losses	3,002	3,625
Investment securities - AFS	20,475	18,178
Held-to-maturity securities:
Amortized Cost	143,442	148,097
Gross Unrealized Gains	0	0
Gross Unrealized Losses	10,377	13,601
Estimated Fair Value	133,065	134,496
Mortgage-backed securities
Available-for-sale securities:
Amortized Cost	91,280	72,183
Gross Unrealized Gains	5	2
Gross Unrealized Losses	7,258	8,666
Investment securities - AFS	84,027	63,519
Held-to-maturity securities:
Amortized Cost	357,870	398,884
Gross Unrealized Gains	0	0
Gross Unrealized Losses	43,864	50,464
Estimated Fair Value	314,006	348,420
Obligations of states and political subdivisions
Held-to-maturity securities:
Amortized Cost	1,470	1,474
Gross Unrealized Gains	57	35
Gross Unrealized Losses	19	28
Estimated Fair Value	1,508	1,481
Other debt securities
Available-for-sale securities:
Amortized Cost	6,080	2,018
Gross Unrealized Gains	59	0
Gross Unrealized Losses	120	128
Investment securities - AFS	6,019	1,890
Held-to-maturity securities:
Amortized Cost	10,500	11,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,249	770
Estimated Fair Value	$ 9,251	$ 10,230