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Income Taxes - Provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Difference between the provision for income taxes and taxes computed by applying the federal statutory income tax rate to income before provision for income taxes      
Income taxes at federal statutory rate $ 147,052 $ 132,479 $ 133,006
Increase (reduction) of taxes resulting from:      
State income taxes, net of federal tax benefit 26,210 19,123 21,491
Non-deductible merger expenses 544   415
Increase in cash surrender value of BOLI policies (6,402) (5,605) (5,105)
Tax-exempt interest (8,090) (7,016) (7,828)
Proportional Amortization 14,419    
Income tax credits (14,038) (14,253) (13,667)
Non-deductible FDIC premiums 5,189 5,330 3,287
Non-deductible executive compensation 3,455 4,745 4,319
Other, net (2,874) 1,741 1,395
Provision for income taxes 165,465 136,544 $ 137,313
Components of the net deferred tax asset      
Allowance for credit losses 123,147 123,496  
Share-based compensation 9,719 10,425  
Pension plan and post-retirement benefits 377 371  
Deferred compensation 13,926 14,039  
Purchase accounting adjustments   1,439  
Capitalized research and development costs 7,715 4,524  
Accrued expenses 7,974 14,470  
FDIC special assessment 4,802 6,168  
Net operating loss and tax credit carryforwards 16,573 20,263  
Nonaccrual interest 3,383 1,773  
Lease liability 25,028 26,076  
Unrealized losses on investment securities available for sale 146,995 142,543  
Other 1,197 2,201  
Total deferred tax assets 360,836 367,788  
Depreciation 12,613 10,439  
Intangible assets 13,091 17,764  
Net deferred loan costs 19,913 16,468  
Right of use assets 23,093 24,161  
Prepaid expense 193 809  
Mark to market liabilities 68,027 92,505  
Tax deductible goodwill 15,613 12,398  
Mortgage servicing rights 21,777 20,863  
Other real estate owned 130 192  
Purchase accounting adjustments 143    
Other 3,294 3,950  
Total deferred tax liabilities 177,887 199,549  
Net deferred tax assets before valuation allowance 182,949 168,239  
Less, valuation allowance (3,065) (3,885)  
Net deferred tax assets $ 179,884 $ 164,354