Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current [Abstract]
Federal	$ 22,829	$ 51,077	$ 35,483
State	5,890	12,934	8,626
Total Current	28,719	64,011	44,109
Deferred [Abstract]
Federal	4,593	(15,862)	507
State	1,365	(3,988)	357
Total Deferred	5,958	(19,850)	864
Total income tax expense	34,677	44,161	44,973
Deferred tax assets [Abstract]
Allowance for loan losses	28,039	24,792
Lease liability	6,917	6,273
Deferred compensation	9,915	9,181
Fair value adjustments on acquisitions	18,306	125
Loan fees	30,778	33,389
Stock-based compensation expense	3,006	2,822
Unrealized losses on securities	45,446	53,663
Other	9,362	5,902
Total deferred tax assets	151,769	136,147
Deferred tax liabilities [Abstract]
Pension benefits	14,742	13,103
Lease right-of-use asset	6,551	5,877
Amortization of intangible assets	22,850	14,112
Premises and equipment, primarily due to accelerated depreciation	2,746	4,889
Other	1,669	846
Total deferred tax liabilities	48,558	38,827
Net deferred tax asset at year-end	103,211	97,320	22,038
Net deferred tax asset at beginning of year	97,320	22,038
Increase in net deferred tax asset	5,891	75,282
Income tax reconciliation [Abstract]
Federal income tax at statutory rate	32,226	41,193	41,971
Tax exempt income	(1,442)	(984)	(1,014)
Net increase in cash surrender value of life insurance	(1,367)	(1,215)	(1,230)
Federal tax credits	(2,855)	(2,417)	(1,884)
State taxes, net of federal tax benefit	5,732	7,067	7,097
Other, net	2,383	517	33
Total income tax expense	34,677	44,161	44,973
Reconciliation of gross unrecognized tax benefits [Roll Forward]
Beginning balance	1,942	1,545
Additions for tax positions of prior years	647	3
Reduction for tax positions of prior years	(104)	0
Current period tax positions	394	394
Ending balance	2,879	1,942	$ 1,545
Amount that would affect the effective tax rate if recognized, gross of tax	$ 2,274	$ 1,535
State and Local Jurisdiction [Member]
Income Tax Examination [Abstract]
Tax years under examination	2017 2018 2019