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Other Real Estate Owned - Summary of Changes in the Balance for OREO (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Real Estate [Abstract]    
Balance at the beginning of year, gross $ 326 $ 250
Transfers in 68 326
Sales proceeds (416) (441)
Gain on disposition 22 191
Balance at the end of year, gross 0 326
Less: valuation allowance 0 0
Balance at the end of year, net $ 0 $ 326