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Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 1,564,306	$ 1,415,959
Gross Unrealized Gains	5,419	25,455
Gross Unrealized Losses	(106,099)	(13,737)
Fair Value	1,463,626	1,427,677
U.S. Treasury and U.S. government sponsored entities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	114,063	93,137
Gross Unrealized Gains	3	32
Gross Unrealized Losses	(9,119)	(2,338)
Fair Value	104,947	90,831
State and political subdivisions
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	681,567	636,724
Gross Unrealized Gains	5,274	23,296
Gross Unrealized Losses	(41,233)	(1,205)
Fair Value	645,608	658,815
Mortgage-backed securities - residential
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	718,295	663,405
Gross Unrealized Gains	117	1,875
Gross Unrealized Losses	(54,717)	(10,094)
Fair Value	663,695	655,186
Collateralized mortgage obligations - residential
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	41,039	13,303
Gross Unrealized Gains	21	153
Gross Unrealized Losses	(735)	(71)
Fair Value	40,325	13,385
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,399	4,009
Gross Unrealized Gains	4	50
Gross Unrealized Losses	(108)	(29)
Fair Value	4,295	4,030
Small Business Administration
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,943	5,381
Gross Unrealized Gains	0	49
Gross Unrealized Losses	(187)	0
Fair Value	$ 4,756	$ 5,430

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