Investment Securities (Gross Unrealized Losses and Fair Value by Length of Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale securities:
Fair value, less than 12 months	$ 24,479	$ 32,180
Unrealized losses, less than 12 months	150	2,541
Fair value, more than 12 months	72,504	50,752
Unrealized losses, more than 12 months	10,230	9,878
Fair Value	96,983	82,932
Unrealized Losses	10,380	12,419
U.S. Treasury and government agencies
Available-for-sale securities:
Fair value, less than 12 months	74	1,165
Unrealized losses, less than 12 months	0	4
Fair value, more than 12 months	17,750	16,585
Unrealized losses, more than 12 months	3,002	3,588
Fair Value	17,824	17,750
Unrealized Losses	3,002	3,592
Held-to-maturity securities:
Fair value, less than 12 months		67,332
Unrealized losses, less than 12 months		2,786
Fair value, more than 12 months		67,163
Unrealized losses, more than 12 months		10,815
Fair Value		134,495
Unrealized Losses		13,601
Mortgage-backed securities
Available-for-sale securities:
Fair value, less than 12 months	24,405	29,125
Unrealized losses, less than 12 months	150	2,409
Fair value, more than 12 months	52,864	34,167
Unrealized losses, more than 12 months	7,108	6,290
Fair Value	77,269	63,292
Unrealized Losses	7,258	8,699
Held-to-maturity securities:
Fair value, less than 12 months		148,771
Unrealized losses, less than 12 months		9,402
Fair value, more than 12 months		199,649
Unrealized losses, more than 12 months		41,062
Fair Value		348,420
Unrealized Losses		50,464
Other debt securities
Available-for-sale securities:
Fair value, less than 12 months	0
Unrealized losses, less than 12 months	0
Fair value, more than 12 months	1,890
Unrealized losses, more than 12 months	120
Fair Value	1,890
Unrealized Losses	$ 120
Held-to-maturity securities:
Fair value, less than 12 months		224,974
Unrealized losses, less than 12 months		12,625
Fair value, more than 12 months		268,951
Unrealized losses, more than 12 months		52,238
Fair Value		493,925
Unrealized Losses		64,863
Obligations of states and political subdivisions
Held-to-maturity securities:
Fair value, less than 12 months		8,091
Unrealized losses, less than 12 months		409
Fair value, more than 12 months		2,139
Unrealized losses, more than 12 months		361
Fair Value		10,230
Unrealized Losses		$ 770