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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, 2015
Dec. 31, 2014
Real Estate [Abstract]    
Balance at the beginning of year, gross $ 2,263 $ 4,695
Transfers in 1,664 139
Charge-offs (381) (1,302)
Sales proceeds (717) (1,502)
Gain on disposition 74 307
Deferred gain recognized   (73)
Depreciation   (1)
Balance at the end of year, gross 2,903 2,263
Less: valuation allowance (224) (375)
Balance at the end of year, net $ 2,679 $ 1,888