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Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 1,585,253	$ 1,415,959
Gross Unrealized Gains	156	25,455
Gross Unrealized Losses	(290,276)	(13,737)
Fair Value	1,295,133	1,427,677
U.S. Treasury and U.S. government sponsored entities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	149,549	93,137
Gross Unrealized Gains	0	32
Gross Unrealized Losses	(21,733)	(2,338)
Fair Value	127,816	90,831
State and political subdivisions
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	686,456	636,724
Gross Unrealized Gains	100	23,296
Gross Unrealized Losses	(137,528)	(1,205)
Fair Value	549,028	658,815
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,386	4,009
Gross Unrealized Gains	0	50
Gross Unrealized Losses	(303)	(29)
Fair Value	4,083	4,030
Mortgage-backed securities - residential
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	687,352	663,405
Gross Unrealized Gains	56	1,875
Gross Unrealized Losses	(126,126)	(10,094)
Fair Value	561,282	655,186
Collateralized mortgage obligations - residential
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	53,390	13,303
Gross Unrealized Gains	0	153
Gross Unrealized Losses	(4,178)	(71)
Fair Value	49,212	13,385
Small Business Administration
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,120	5,381
Gross Unrealized Gains	0	49
Gross Unrealized Losses	(408)	0
Fair Value	$ 3,712	$ 5,430

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