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Loans and Leases (Narrative) (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Loans and Leases Receivable Disclosure [Abstract]      
Interest on non-accrual loans that would have been recorded as additional interest income $ 16.9 $ 11.0 $ 9.7
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans and Leases | loan 107 150 192
Unamortized premiums $ (68.7) $ 12.3  
Commercial non-mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans and Leases | loan 3    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default $ 3.6    
Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans and Leases | loan 2    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default $ 0.6    
Other consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans and Leases | loan 2    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default $ 0.3    
Collateral Pledged [Member] | Federal Home Loan Bank Certificates and Obligations (FHLB) | Asset Pledged as Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, after Allowance for Credit Loss 13,700.0    
Commercial      
Loans and Leases Receivable Disclosure [Abstract]      
Write-down of TDR's $ (14.7) $ (3.0) $ (17.6)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans and Leases | loan   0 4
Financing Receivable, Troubled Debt Restructuring, Subsequent Default     $ 12.4