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Loans and Allowance for Credit Losses - Troubled Debt Restructured Loans and Commitments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable Disclosure [Abstract]      
Accrual status $ 8,757 $ 11,563 $ 13,790
Nonaccrual status 11,761 11,222 11,569
Total 20,518 22,785 25,359
Letters of Credit Outstanding, Amount 60 60 0
Unused lines of credit $ 1,027 $ 54 $ 358