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Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 1,530,768	$ 1,534,512
Gross Unrealized Gains	400	278
Gross Unrealized Losses	(320,432)	(266,765)
Fair Value	1,210,736	1,268,025
U.S. Treasury and U.S. government sponsored entities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	145,395	149,712
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(24,084)	(21,616)
Fair Value	121,311	128,096
State and political subdivisions
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	645,407	651,705
Gross Unrealized Gains	134	266
Gross Unrealized Losses	(147,405)	(121,891)
Fair Value	498,136	530,080
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	18,439	4,181
Gross Unrealized Gains	5	0
Gross Unrealized Losses	(693)	(302)
Fair Value	17,751	3,879
Mortgage-backed securities - residential
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	636,646	672,784
Gross Unrealized Gains	0	12
Gross Unrealized Losses	(141,605)	(117,654)
Fair Value	495,041	555,142
Collateralized mortgage obligations
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	81,567	52,291
Gross Unrealized Gains	261	0
Gross Unrealized Losses	(6,276)	(4,937)
Fair Value	75,552	47,354
Small Business Administration
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,314	3,839
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(369)	(365)
Fair Value	$ 2,945	$ 3,474

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