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Loans - Summary of Loans (Parenthetical) (Detail) - Paycheck Protection Program [Member]
$ in Millions
Sep. 30, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Principal amount outstanding on PPP loans $ 92.1
Commercial [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Principal amount outstanding on PPP loans $ 92.1