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Loans - Summary of Information Pertaining to Non Accrual Non Covered Loans (Phantoms) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 24,386 $ 24,412
Acquired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 9,758 9,032
Acquired loans | ASC 310-30    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 2,200 $ 1,700