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Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 1,579,112	$ 1,534,512
Gross Unrealized Gains	3,871	278
Gross Unrealized Losses	(227,534)	(266,765)
Fair Value	1,355,449	1,268,025
U.S. Treasury and U.S. government sponsored entities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	154,879	149,712
Gross Unrealized Gains	194	0
Gross Unrealized Losses	(17,900)	(21,616)
Fair Value	137,173	128,096
State and political subdivisions
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	650,520	651,705
Gross Unrealized Gains	2,751	266
Gross Unrealized Losses	(98,022)	(121,891)
Fair Value	555,249	530,080
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	18,726	4,181
Gross Unrealized Gains	234	0
Gross Unrealized Losses	(275)	(302)
Fair Value	18,685	3,879
Mortgage-backed securities - residential
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	666,828	672,784
Gross Unrealized Gains	73	12
Gross Unrealized Losses	(106,256)	(117,654)
Fair Value	560,645	555,142
Collateralized mortgage obligations
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	84,559	52,291
Gross Unrealized Gains	619	0
Gross Unrealized Losses	(4,771)	(4,937)
Fair Value	80,407	47,354
Small Business Administration
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	3,600	3,839
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(310)	(365)
Fair Value	$ 3,290	$ 3,474

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