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Foreclosed Assets - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Foreclosed assets $ 0   $ 0
Gain On Sale Of Foreclosed Assets 103 $ 0  
Loans in process of foreclosure $ 142   $ 0