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Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 1,561,850	$ 1,534,512
Gross Unrealized Gains	1,201	278
Gross Unrealized Losses	(246,173)	(266,765)
Fair Value	1,316,878	1,268,025
U.S. Treasury and U.S. government sponsored entities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	155,169	149,712
Gross Unrealized Gains	99	0
Gross Unrealized Losses	(20,103)	(21,616)
Fair Value	135,165	128,096
State and political subdivisions
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	648,030	651,705
Gross Unrealized Gains	951	266
Gross Unrealized Losses	(105,919)	(121,891)
Fair Value	543,062	530,080
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	18,329	4,181
Gross Unrealized Gains	25	0
Gross Unrealized Losses	(722)	(302)
Fair Value	17,632	3,879
Mortgage-backed securities - residential
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	653,898	672,784
Gross Unrealized Gains	9	12
Gross Unrealized Losses	(112,783)	(117,654)
Fair Value	541,124	555,142
Collateralized mortgage obligations
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	82,965	52,291
Gross Unrealized Gains	117	0
Gross Unrealized Losses	(6,286)	(4,937)
Fair Value	76,796	47,354
Small Business Administration
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,459	3,839
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(360)	(365)
Fair Value	$ 3,099	$ 3,474

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