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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Additional Information (Detail)
3 Months Ended
Mar. 31, 2022
USD ($)
loan
commitment
Mar. 31, 2021
USD ($)
loan
Dec. 31, 2021
USD ($)
commitment
Dec. 31, 2020
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Accrued interest $ 80,700,000   $ 81,600,000  
Loans receivable, excluding accrued interest $ 13,924,668,000   14,414,827,000  
Loans held for sale, average life from purchase to sale 30 days      
Loans and leases receivable $ 10,118,855,000   9,018,298,000  
Interest income 157,175,000 $ 152,117,000    
Allowance for credit loss, excluding accrued interest 145,847,000 $ 128,736,000 137,804,000 $ 144,176,000
Allowance for credit loss, period increase 8,000,000      
Loans reported as TDR $ 16,600,000   16,500,000  
Minimum performance requirement (months) 6 months      
Lease receivable, TDR $ 0   $ 0  
Number of loans | loan 42 28    
Number of commitments to lend additional funds (commitment) | commitment 0   0  
Loans pledged as collateral $ 3,600,000,000   $ 3,700,000,000  
Small Business Administration (SBA), CARES Act, Paycheck Protection Program        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loans and leases receivable 2,200,000,000   3,300,000,000  
Interest income $ 36,900,000 $ 38,800,000    
Troubled Debt Restructurings        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impairment modification minimum period (months) 9 months      
Commercial real estate non-owner occupied        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amount deferred, CARES Act $ 3,300,000      
Consumer loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amount deferred, CARES Act     6,100,000  
Forgiveness of debt        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of loans | loan 0 0    
Commercial Real Estate | Commercial and industrial | Collateral Dependent Loan        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loans receivable, excluding accrued interest $ 31,800,000   $ 38,900,000