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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Federal $ 67,711,000 $ 104,141,000 $ 125,016,000  
Current State and Local Tax Expense (Benefit) 11,775,000 12,870,000 11,798,000  
Total current tax expense (benefit) 79,486,000 117,011,000 136,814,000  
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Federal 67,446,000 15,082,000 (12,149,000)  
State 4,922,000 4,658,000 (83,000)  
Deferred tax (expense) benefit 72,368,000 19,740,000 (12,232,000)  
Income tax expense (benefit) 151,854,000 136,751,000 124,582,000  
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income tax expense (benefit) at statutory rate 149,941,000 146,474,000 136,900,000  
State excise tax expense, net of federal tax effect 13,191,000 13,847,000 9,255,000  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 5,186,000 5,481,000 2,149,000  
Tax-exempt securities (21,663,000) (18,730,000) (15,243,000)  
Federal tax credits (5,238,000) (5,019,000) (4,712,000)  
Income Tax Reconciliation, Bank owned life insurance surrender [Abstract] 8,572,000 0 0  
Effective Income Tax Rate Reconciliation, Nondeductible FDIC Expense, Amount 5,361,000 2,331,000 1,697,000  
Bank owned life insurance income (4,324,000) (4,599,000) (4,413,000)  
Insurance premiums 0 (36,000) (273,000)  
Excess tax benefits associated with equity compensation (208,000) (3,027,000) (2,475,000)  
Other items $ 1,036,000 29,000 1,697,000  
Federal income tax statutory rate 21.00%      
Deferred Tax Assets, Net [Abstract]        
Loan loss allowance $ 86,911,000 77,015,000    
Loans 4,659,000 10,576,000    
Insurance 784,000 817,000    
Accrued liability for supplemental retirement agreements 7,005,000 7,595,000    
Restricted stock and stock options 6,251,000 7,795,000    
Securities 49,331,000 67,286,000    
Leases 76,918,000 35,589,000    
Other real estate owned 750,000 1,526,000    
Net federal operating loss carryforward and credits 1,064,000 1,168,000    
Annual Incentive Compensation 11,842,000 21,322,000    
Deferred Tax Assets Investment in Noncontrolled Affiliates 13,541,000 31,559,000    
Allowance for off balance sheet credit exposures 4,367,000 6,527,000    
deferred tax assets deferred tax credits 0 8,282,000    
Other deferred tax assets 2,532,000 3,267,000    
Total deferred tax assets 273,205,000 280,324,000    
Deferred Tax Liabilities, Net [Abstract]        
Depreciation and amortization 23,140,000 17,723,000    
Core deposit and other intangible assets 6,087,000 9,070,000    
REIT dividends 2,604,000 2,338,000    
FHLB related liabilities 125,000 328,000    
Right-of-use assets and other leasing transactions 74,068,000 33,157,000    
Deferred Tax Liabilities, Leases 67,711,000 35,547,000    
Subordinated debt 1,412,000 1,662,000    
Partnership interests 42,000 76,000    
Deferred Tax Liabilities, Tax Credit Investments 7,614,000 0    
Deferred Tax Liabilities, Derivatives 836,000 6,854,000    
Other deferred tax liabilities 2,356,000 2,054,000    
Total deferred tax liabilities 185,995,000 108,809,000    
Net deferred tax assets 87,210,000 171,515,000    
Unrecognized Tax Benefits 8,806,000 15,752,000 12,737,000 $ 9,658,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 642,000 3,721,000 3,647,000  
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 0 0 0  
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations (1,340,000) (706,000) (568,000)  
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities (6,248,000)      
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities   0 0  
Tax Credit Carryforward, Amount 4,800,000      
Income Tax Examination, Penalties and Interest Expense 80,000 264,000 $ 0  
Deferred Tax Assets, Regulatory Assets and Liabilities 7,250,000 $ 0    
Federal Deposit Insurance Corporation Special Assessment 29,000,000      
BOLI Resturcting Charge 7,200,000      
BOLI Penalty $ 9,100,000