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Loans and Leases - Narrative (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unamortized premiums $ 16,300 $ (1,800)
Interest receivable 282,500 265,000
Loans and leases, net $ 55,877,699 $ 51,815,602
Prepaid expenses | Customer Concentration Risk | Loans and Finance Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Concentration of credit risk 39.50% 40.70%
Commercial non-mortgage | Customer Concentration Risk | Loans and Finance Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Concentration of credit risk 36.00% 34.40%
Commercial non-mortgage | Payment Delay    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Modified loans $ 3,900 $ 17,800
Accounts receivable | Payment Delay    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Modified loans 16,500  
Collateral Pledged | Commercial portfolio    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Recorded investment 308,300 139,500
Collateral Pledged | Consumer portfolio    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Recorded investment 28,100 29,100
Collateral Pledged | Asset Pledged as Collateral | Federal Home Loan Bank Certificates and Obligations (FHLB)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, net 17,200,000  
Collateral Pledged | Asset Pledged as Collateral | Federal Reserve Bank Certificates And Obligations (FRB)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, net 7,200,000  
Collateral Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Recorded investment $ 364,300 $ 200,100