Investment Securities, Analysis of Gross Unrealized Losses (Details) $ in Thousands	Dec. 31, 2023 USD ($) Security	Dec. 31, 2022 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 32,025	$ 275,604
12 months or more, fair value	470,459	327,817
Total fair value	502,484	603,421
Less than 12 months, unrealized losses	(188)	(14,760)
12 Months or more, unrealized losses	(48,502)	(51,034)
Total unrealized losses	$ (48,690)	(65,794)
Investment securities in unrealized loss position less than 12 months | Security	31
Investment securities in unrealized loss position more than 12 months | Security	454
Allowance for credit losses on available-for-sale securities	$ 0	0
Public Deposits or Other [Member] | Asset Pledged as Collateral [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Investment securities	43,884	44,318
U.S. Treasury Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	0	54,574
12 months or more, fair value	77,203	56,872
Total fair value	77,203	111,446
Less than 12 months, unrealized losses	0	(1,680)
12 Months or more, unrealized losses	(3,015)	(4,162)
Total unrealized losses	(3,015)	(5,842)
Allowance for credit losses on available-for-sale securities	0
Securities of U.S. Government Agencies and Corporations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	3,424	45,261
12 months or more, fair value	97,057	69,635
Total fair value	100,481	114,896
Less than 12 months, unrealized losses	(7)	(1,341)
12 Months or more, unrealized losses	(6,324)	(8,465)
Total unrealized losses	(6,331)	(9,806)
Allowance for credit losses on available-for-sale securities	0
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	4,981	40,479
12 months or more, fair value	32,578	10,049
Total fair value	37,559	50,528
Less than 12 months, unrealized losses	(31)	(3,022)
12 Months or more, unrealized losses	(3,550)	(2,620)
Total unrealized losses	(3,581)	(5,642)
Allowance for credit losses on available-for-sale securities	0
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	6,597	36,040
12 months or more, fair value	80,995	59,310
Total fair value	87,592	95,350
Less than 12 months, unrealized losses	(26)	(2,586)
12 Months or more, unrealized losses	(16,700)	(17,047)
Total unrealized losses	(16,726)	(19,633)
Allowance for credit losses on available-for-sale securities	0
Mortgage-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	17,023	99,250
12 months or more, fair value	182,626	131,951
Total fair value	199,649	231,201
Less than 12 months, unrealized losses	(124)	(6,131)
12 Months or more, unrealized losses	(18,913)	(18,740)
Total unrealized losses	(19,037)	$ (24,871)
Allowance for credit losses on available-for-sale securities	$ 0