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Deposits - Summary of Deposit Accounts (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Investments Schedule [Abstract]    
Noninterest-bearing demand deposits $ 114,122 $ 103,037
Interest-bearing:    
Savings deposits 57,472 62,896
Demand deposits 76,302 90,585
Money market deposits 225,626 146,339
Time deposits less than $250 306,720 299,825
Time deposits $250 or more 61,950 59,164
Total deposits $ 842,192 $ 761,846