Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities
Amortized Cost		$ 1,292,331	$ 1,300,719
Gross Unrealized Gains		3,344	1,104
Gross Unrealized Losses		(162,236)	(170,424)
Fair Value	[1]	1,133,439	1,131,399
U.S. Treasury and government agencies
Schedule of Available-for-sale Securities
Amortized Cost		78,769	158,473
Gross Unrealized Gains		232	0
Gross Unrealized Losses		(3,746)	(6,051)
Fair Value		75,255	152,422
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Amortized Cost		111,070	101,753
Gross Unrealized Gains		0	18
Gross Unrealized Losses		(12,746)	(13,656)
Fair Value		98,324	88,115
States and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost		280,498	261,612
Gross Unrealized Gains		77	12
Gross Unrealized Losses		(32,304)	(35,742)
Fair Value		248,271	225,882
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost		737,345	707,025
Gross Unrealized Gains		852	1,017
Gross Unrealized Losses		(102,710)	(103,389)
Fair Value		635,487	604,653
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost		62,961	61,091
Gross Unrealized Gains		1	0
Gross Unrealized Losses		(10,132)	(11,042)
Fair Value		52,830	50,049
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Amortized Cost		21,688	10,765
Gross Unrealized Gains		2,182	57
Gross Unrealized Losses		(598)	(544)
Fair Value		$ 23,272	$ 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 $241, respectively, at June 30, 2023 and December 31, 2022.