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Other Real Estate Owned - Summary of Activity Related to Total OREO (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]    
Balance, beginning of period $ 6,993 $ 5,637
Additions   3,721
Dispositions (2,129) (2,203)
Valuation adjustments (337) (162)
Balance, end of period $ 4,527 $ 6,993