Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities
Amortized cost		$ 1,184,288	$ 1,300,719
Gross Unrealized Gains		3,240	1,104
Gross Unrealized Losses		(139,206)	(170,424)
Fair Value	[1]	1,048,322	1,131,399
U.S. Treasury and government agencies
Schedule of Available-for-sale Securities
Amortized cost		30,999	158,473
Gross Unrealized Gains		292	0
Gross Unrealized Losses		(995)	(6,051)
Fair Value		30,296	152,422
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Amortized cost		128,500	101,753
Gross Unrealized Gains		639	18
Gross Unrealized Losses		(10,532)	(13,656)
Fair Value		118,607	88,115
States and political subdivisions
Schedule of Available-for-sale Securities
Amortized cost		239,906	261,612
Gross Unrealized Gains		485	12
Gross Unrealized Losses		(27,095)	(35,742)
Fair Value		213,296	225,882
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized cost		717,772	707,025
Gross Unrealized Gains		1,819	1,017
Gross Unrealized Losses		(90,667)	(103,389)
Fair Value		628,924	604,653
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized cost		60,611	61,091
Gross Unrealized Gains		5	0
Gross Unrealized Losses		(9,382)	(11,042)
Fair Value		51,234	50,049
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Amortized cost		6,500	10,765
Gross Unrealized Gains		0	57
Gross Unrealized Losses		(535)	(544)
Fair Value		$ 5,965	$ 10,278

[1] Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $238, respectively, at December 31, 2023 and $0 and $241, respectively, at December 31, 2022.