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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]          
Fees paid to law firms $ 8 $ 12 $ 29 $ 33  
Directors, Executive Officers and Affiliates [Member]          
Related Party Transaction [Line Items]          
Deposits from directors, executive officers and affiliates $ 1,708   $ 1,708   $ 938