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Loans and Leases (Narrative) (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Loans and Leases Receivable Disclosure [Abstract]      
Interest on non-accrual loans that would have been recorded as additional interest income $ 11,000 $ 9,700 $ 11,300
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans and Leases | loan 150 192 136
Decrease in ACL on loans and leases $ 58,200    
Commercial Portfolio Segment [Member]      
Loans and Leases Receivable Disclosure [Abstract]      
Write-down of TDR's $ (3,000) $ (17,600) $ (20,300)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans and Leases | loan 0 4  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   $ 12,400