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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, 2020
Dec. 31, 2019
Receivables [Abstract]    
Other real estate owned $ 730 $ 4,062
Repossessed assets 8 116
Total other real estate owned and repossessed assets $ 738 $ 4,178