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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
Jun. 15, 2023
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
loan
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
loan
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]                  
Accrued interest   $ 96,800,000   $ 96,800,000     $ 105,500,000    
Loans receivable, excluding accrued interest   13,423,901,000   $ 13,423,901,000     15,335,435,000    
Loans held for sale, average life from purchase to sale       30 days          
Loans and leases receivable   12,463,485,000   $ 12,463,485,000     13,144,894,000    
Allowance for credit loss, excluding accrued interest   139,213,000 $ 130,197,000 139,213,000 $ 130,197,000 $ 139,656,000 130,924,000 $ 156,530,000 $ 137,804,000
Allowance for credit loss, period increase       8,300,000          
Number of commitments to lend additional funds (commitment)   0   0     0    
Loans reported as TDR             16,800,000    
Number of loans | loan     71   184        
Purchases   101,735,000 $ 137,814,000 750,400,000 $ 368,776,000        
Loans and leases receivable, charge-offs   30,020,000 21,484,000 69,713,000 45,935,000        
Legal settlement expense   4,096,000 $ 0 4,096,000 $ 0        
Asset Pledged as Collateral                  
Financing Receivable, Troubled Debt Restructuring [Line Items]                  
Loans and leases receivable   8,500,000,000   8,500,000,000     7,100,000,000    
Forgiveness of debt                  
Financing Receivable, Troubled Debt Restructuring [Line Items]                  
Number of loans | loan     0   0        
Small Business Administration (SBA), CARES Act, Paycheck Protection Program                  
Financing Receivable, Troubled Debt Restructuring [Line Items]                  
Loans and leases receivable   137,100,000   137,100,000     998,200,000    
Interest income   600,000 $ 14,700,000 25,800,000 $ 72,100,000        
Loans and leases receivable, charge-offs       7,000,000          
Specialty lending | FDIC                  
Financing Receivable, Troubled Debt Restructuring [Line Items]                  
Purchases $ 631,000,000                
Specialty lending                  
Financing Receivable, Troubled Debt Restructuring [Line Items]                  
Purchases   0 $ 0 631,252,000 $ 0        
Commercial Real Estate | Other commercial and industrial | Collateral Dependent Loan                  
Financing Receivable, Troubled Debt Restructuring [Line Items]                  
Loans receivable, excluding accrued interest   $ 18,400,000   $ 18,400,000     $ 11,500,000