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Loans and the Allowance for Credit Losses - Summary of Other Real Estate Owned and Repossessed Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Other real estate owned $ 3,662 $ 7,173
Repossessed assets 16 92
Total other real estate owned and repossessed assets $ 3,678 $ 7,265