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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, 2016
Dec. 31, 2015
Real Estate [Abstract]    
Balance at the beginning of year, gross $ 2,903 $ 2,263
Transfers in 287 1,664
Charge-offs (251) (381)
Sales proceeds (2,882) (717)
Gain on disposition 193 74
Balance at the end of year, gross 250 2,903
Less: valuation allowance   (224)
Balance at the end of year, net $ 250 $ 2,679