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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Commitment
Dec. 31, 2020
USD ($)
Commitment
Sep. 30, 2021
USD ($)
Loan
Commitment
Sep. 30, 2020
USD ($)
Loan
Sep. 30, 2021
USD ($)
Loan
Commitment
Sep. 30, 2020
USD ($)
Loan
Dec. 31, 2020
USD ($)
Commitment
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]                    
Accrued interest $ 87,700,000 $ 76,600,000 $ 87,700,000   $ 87,700,000   $ 76,600,000      
Loans receivable, excluding accrued interest 15,354,084,000 15,608,989,000 15,354,084,000   15,354,084,000   15,608,989,000      
Loans and leases receivable 7,970,599,000 7,575,368,000 7,970,599,000   7,970,599,000   7,575,368,000      
Interest income     233,097,000 $ 132,107,000 $ 538,822,000 $ 366,634,000        
Loans held for sale, average life from purchase to sale         30 days          
Allowance for credit loss, excluding accrued interest 131,496,000 144,176,000 131,496,000 $ 155,561,000 $ 131,496,000 $ 155,561,000 144,176,000 $ 125,436,000 $ 159,905,000 $ 56,379,000
Allowance for credit loss, period decrease         12,700,000          
Loans reported as TDR 17,000,000 16,100,000 17,000,000   $ 17,000,000   16,100,000      
Minimum performance requirement (months)         6 months          
Lease receivable, TDR $ 0 $ 0 $ 0   $ 0   $ 0      
Number of loans | Loan     43 67 174 105        
Number of commitments to lend additional funds (commitment) | Commitment 0 0 0   0   0      
Purchased-credit-impaired loans $ 11,000,000 $ 13,400,000     $ 11,000,000   $ 13,400,000      
Loans pledged as collateral 3,700,000,000 8,500,000,000 $ 3,700,000,000   $ 3,700,000,000   8,500,000,000      
Troubled Debt Restructurings                    
Financing Receivable, Troubled Debt Restructuring [Line Items]                    
Impairment modification minimum period (months)         9 months          
Small Business Administration (SBA), CARES Act, Paycheck Protection Program                    
Financing Receivable, Troubled Debt Restructuring [Line Items]                    
Loans and leases receivable 5,000,000,000 4,600,000,000 5,000,000,000   $ 5,000,000,000   4,600,000,000      
Interest income     117,100,000 $ 24,300,000 197,100,000 $ 36,000,000        
Commercial real estate non-owner occupied                    
Financing Receivable, Troubled Debt Restructuring [Line Items]                    
Amount deferred, CARES Act 73,400,000 202,100,000 73,400,000   73,400,000   202,100,000      
Consumer loans                    
Financing Receivable, Troubled Debt Restructuring [Line Items]                    
Amount deferred, CARES Act 6,700,000 16,400,000 $ 6,700,000   $ 6,700,000   16,400,000      
Forgiveness of debt                    
Financing Receivable, Troubled Debt Restructuring [Line Items]                    
Number of loans | Loan     0 0 0 0        
Commercial Real Estate | Commercial and industrial | Collateral Dependent Loan                    
Financing Receivable, Troubled Debt Restructuring [Line Items]                    
Loans receivable, excluding accrued interest $ 41,600,000 59,500,000 $ 41,600,000   $ 41,600,000   59,500,000      
Government-Guaranteed Collateral | Small Business Administration (SBA), CARES Act, Paycheck Protection Program                    
Financing Receivable, Troubled Debt Restructuring [Line Items]                    
Loans pledged as collateral   $ 4,600,000,000         $ 4,600,000,000