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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 15, 2023
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
loan
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
loan
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]                  
Accrued interest   $ 99,800,000   $ 99,800,000     $ 105,500,000    
Loans receivable, excluding accrued interest   13,693,143,000   $ 13,693,143,000     15,335,435,000    
Loans held for sale, average life from purchase to sale       30 days          
Loans and leases receivable   12,637,768,000   $ 12,637,768,000     13,144,894,000    
Allowance for credit loss, excluding accrued interest   139,656,000 $ 156,530,000 139,656,000 $ 156,530,000 $ 130,281,000 130,924,000 $ 145,847,000 $ 137,804,000
Allowance for credit loss, period increase       8,800,000          
Number of commitments to lend additional funds (commitment)   0   0     0    
Loans reported as TDR             16,800,000    
Number of loans | loan     71   113        
Purchases   636,115,000 $ 24,632,000 648,665,000 $ 230,962,000        
Asset Pledged as Collateral                  
Financing Receivable, Troubled Debt Restructuring [Line Items]                  
Loans and leases receivable   8,600,000,000   8,600,000,000     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   188,800,000   188,800,000     998,200,000    
Interest income   1,600,000 $ 20,600,000 25,200,000 $ 57,500,000        
Specialty lending | FDIC                  
Financing Receivable, Troubled Debt Restructuring [Line Items]                  
Purchases $ 631,000,000                
Purchased-credit-impaired loans $ 228,700,000                
Specialty lending                  
Financing Receivable, Troubled Debt Restructuring [Line Items]                  
Purchases   631,252,000 $ 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   $ 17,100,000   $ 17,100,000     $ 11,500,000