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Deposits - Summary of Deposit Accounts (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Banking And Thrift [Abstract]    
Noninterest-bearing demand deposits $ 137,933 $ 114,122
Interest-bearing:    
Savings deposits 56,785 57,472
Demand deposits 71,750 76,302
Money market deposits 254,072 225,626
Time deposits less than $250 299,649 306,720
Time deposits $250 or more 90,251 61,950
Total deposits $ 910,440 $ 842,192