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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Federal $ 110,464,000 $ 67,711,000 $ 104,141,000  
Current State and Local Tax Expense (Benefit) 15,040,000 11,775,000 12,870,000  
Total current tax expense (benefit) 125,504,000 79,486,000 117,011,000  
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Federal (19,550,000) 67,446,000 15,082,000  
State 199,000 4,922,000 4,658,000  
Deferred tax (expense) benefit (19,351,000) 72,368,000 19,740,000  
Income tax expense (benefit) 106,153,000 151,854,000 136,751,000  
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income tax expense (benefit) at statutory rate 122,054,000 149,941,000 146,474,000  
State excise tax expense, net of federal tax effect 12,039,000 13,191,000 13,847,000  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 5,635,000 5,186,000 5,481,000  
Tax-exempt securities (22,169,000) (21,663,000) (18,730,000)  
Federal tax credits (8,170,000) (5,238,000) (5,019,000)  
Income Tax Reconciliation, Bank owned life insurance surrender [Abstract] 0 8,572,000 0  
Effective Income Tax Rate Reconciliation, Nondeductible FDIC Expense, Amount 7,103,000 5,361,000 2,331,000  
Bank owned life insurance income (8,780,000) (4,324,000) (4,599,000)  
Insurance premiums 0 0 (36,000)  
Excess tax benefits associated with equity compensation (2,806,000) (208,000) (3,027,000)  
Other items $ 1,247,000 1,036,000 29,000  
Federal income tax statutory rate 21.00%      
Deferred Tax Assets, Net [Abstract]        
Loan loss allowance $ 99,002,000 86,911,000    
Loans 4,463,000 4,659,000    
Insurance 878,000 784,000    
Accrued liability for supplemental retirement agreements 6,611,000 7,005,000    
Restricted stock and stock options 8,255,000 6,251,000    
Securities 44,504,000 49,331,000    
Cash flow hedge 8,772,000 0    
Deferred tax liabilities, Federal home loan bank related assets 64,000 0    
Leases 76,426,000 76,918,000    
Other real estate owned 0 750,000    
Net federal operating loss carryforward and credits 9,621,000 1,064,000    
Annual Incentive Compensation 20,473,000 11,842,000    
Deferred Tax Assets Investment in Noncontrolled Affiliates 33,747,000 13,541,000    
Allowance for off balance sheet credit exposures 3,117,000 4,367,000    
deferred tax assets deferred tax credits 2,601,000 0    
Other deferred tax assets 2,426,000 1,688,000    
Total deferred tax assets 328,679,000 273,205,000    
Deferred Tax Liabilities, Net [Abstract]        
Depreciation and amortization 20,438,000 23,140,000    
Core deposit and other intangible assets 5,193,000 6,087,000    
REIT dividends 2,247,000 2,604,000    
Deferred Tax Liabilities, Mortgage Servicing Rights 2,963,000 0    
FHLB related liabilities 0 125,000    
Right-of-use assets and other leasing transactions 72,886,000 74,068,000    
Deferred Tax Liabilities, Leases 83,810,000 67,711,000    
Subordinated debt 1,293,000 1,412,000    
Partnership interests 18,000 42,000    
Deferred Tax Liabilities, Tax Credit Investments 0 7,614,000    
Deferred Tax Liabilities, Prepaid Expenses 1,611,000 273,000    
Deferred Tax Liabilities, Derivatives 0 836,000    
Other deferred tax liabilities 2,748,000 2,083,000    
Total deferred tax liabilities 193,207,000 185,995,000    
Net deferred tax assets 135,472,000 87,210,000    
Unrecognized Tax Benefits 10,127,000 8,806,000 15,752,000 $ 12,737,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 140,000 642,000 3,721,000  
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 3,831,000 0 0  
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations (1,750,000) (1,340,000) (706,000)  
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities (900,000) (6,248,000)    
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities     0  
Tax Credit Carryforward, Amount 4,300,000      
Income Tax Examination, Penalties and Interest Expense 41,000 80,000 $ 264,000  
Deferred Tax Assets, Regulatory Assets and Liabilities 6,254,000 7,250,000    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities $ 1,465,000 844,000    
BOLI Resturcting Charge   7,200,000    
BOLI Penalty   $ 9,100,000