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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Federal $ 125,016,000 $ 98,082,000 $ 77,422,000  
Current State and Local Tax Expense (Benefit) 11,798,000 19,270,000 4,538,000  
Total current tax expense (benefit) 136,814,000 117,352,000 81,960,000  
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Federal (12,149,000) (45,450,000) 12,446,000  
State (83,000) (12,865,000) 2,250,000  
Deferred tax (expense) benefit (12,232,000) (58,315,000) 14,696,000  
Income tax expense (benefit) 124,582,000 59,037,000 96,656,000  
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income tax expense (benefit) at statutory rate 136,900,000 77,985,000 104,483,000  
State excise tax expense, net of federal tax effect 9,255,000 5,059,000 5,363,000  
Tax-exempt securities (15,243,000) (13,706,000) (11,078,000)  
Federal tax credits (4,712,000) (3,717,000) (1,704,000)  
Bank owned life insurance (4,413,000) (4,759,000) (3,646,000)  
Insurance premiums (273,000) (272,000) (238,000)  
Excess tax benefits associated with equity compensation (2,475,000) (417,000) (1,011,000)  
Other items $ 5,543,000 (1,136,000) 4,487,000  
Federal income tax statutory rate 21.00%      
Deferred Tax Assets, Net [Abstract]        
Loan loss allowance $ 66,785,000 72,316,000    
Loans 14,778,000 14,694,000    
Insurance 759,000 690,000    
Accrued liability for supplemental retirement agreements 7,612,000 7,457,000    
Restricted stock and stock options 9,148,000 9,181,000    
Equity Method Investments 0 171,000    
Leases 26,476,000 23,894,000    
Other real estate owned 1,540,000 2,287,000    
Net federal operating loss carryforward and credits 1,271,000 1,796,000    
Annual Incentive Compensation 23,095,000 8,712,000    
Deferred Tax Assets Investment in Noncontrolled Affiliates 27,653,000 25,225,000    
Allowance for off balance sheet credit exposures 5,873,000 6,069,000    
Other deferred tax assets 1,941,000 2,559,000    
Total deferred tax assets 186,931,000 175,051,000    
Deferred Tax Liabilities, Net [Abstract]        
Depreciation and amortization 14,520,000 14,418,000    
Core deposit and other intangible assets 8,787,000 11,077,000    
Securities 21,680,000 34,373,000    
REIT dividends 1,222,000 1,366,000    
FHLB related liabilities 1,600,000 1,798,000    
Right-of-use assets and other leasing transactions 24,315,000 22,232,000    
Subordinated debt 1,791,000 1,920,000    
Partnership interests 23,000 0    
Deferred Tax Liabilities, Derivatives 9,890,000 19,627,000    
Other deferred tax liabilities 1,831,000 1,630,000    
Total deferred tax liabilities 85,659,000 108,441,000    
Net deferred tax assets 101,272,000 66,610,000    
Unrecognized Tax Benefits 12,737,000 9,658,000 6,910,000 $ 5,083,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 3,647,000 2,748,000 1,827,000  
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 (568,000) 0 0  
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities 0 0 0  
Tax Credit Carryforward, Amount 5,700,000      
Income Tax Examination, Penalties and Interest Expense $ 0 $ 571,000 $ 0