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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current [Abstract]      
Federal $ 23,049 $ 22,829 $ 51,077
State 7,039 5,890 12,934
Total current 30,088 28,719 64,011
Deferred [Abstract]      
Federal 8,306 4,593 (15,862)
State 423 1,365 (3,988)
Total deferred 8,729 5,958 (19,850)
Total income tax expense 38,817 34,677 44,161
Deferred tax assets [Abstract]      
Allowance for loan losses 29,229 28,039  
Lease liability 7,646 6,917  
Deferred compensation 10,581 9,915  
Fair value adjustments on acquisitions 15,958 18,306  
Loan fees 23,660 30,778  
Stock-based compensation expense 3,375 3,006  
Unrealized losses on securities 41,346 45,446  
Other 6,382 9,362  
Total deferred tax assets 138,177 151,769  
Deferred tax liabilities [Abstract]      
Pension benefits 16,705 14,742  
Lease right-of-use asset 7,195 6,551  
Amortization of intangible assets 22,476 22,850  
Premises and equipment, primarily due to accelerated depreciation 1,510 2,746  
Other 2,072 1,669  
Total deferred tax liabilities 49,958 48,558  
Net deferred tax asset at year-end 88,219 103,211 97,320
Net deferred tax asset at beginning of year 103,211 97,320  
(Decrease) increase in net deferred tax asset (14,992) 5,891  
Income tax reconciliation [Abstract]      
Federal income tax at statutory rate 37,686 32,226 41,193
Tax exempt income (1,783) (1,442) (984)
Net increase in cash surrender value of life insurance (1,866) (1,367) (1,215)
Federal tax credits (1,171) (1,297) (1,398)
State taxes, net of federal tax benefit 6,008 5,732 7,067
Other, net (57) 825 (502)
Total income tax expense 38,817 34,677 44,161
Reconciliation of gross unrecognized tax benefits [Roll Forward]      
Beginning balance 2,879 1,942  
Additions for tax positions of prior years 57 647  
Reduction for tax positions of prior years (265) (104)  
Current period tax positions 243 394  
Ending balance 2,914 2,879 $ 1,942
Amount that would affect the effective tax rate if recognized, gross of tax 2,302 2,274  
Income Tax Examination [Abstract]      
Interest expense $ 600 $ 500  
State and Local Jurisdiction [Member]      
Income Tax Examination [Abstract]      
Tax years under examination 2017 2018 2019