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Loans and Leases (Narrative) (Detail)
12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Loans and Leases Receivable Disclosure [Abstract]      
Interest on non-accrual loans that would have been recorded as additional interest income $ 9,700,000 $ 11,300,000 $ 9,700,000
Write-down of TDR's $ (18,400,000) $ (21,800,000) $ (14,300,000)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans and Leases | loan 192 136 143
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans and Leases | loan 4 7  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default $ 12,400,000 $ 2,600,000 $ 0