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Other Real Estate Owned (OREO) - Summary of Changes in the Balance for OREO (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Real Estate [Abstract]      
Balance at the beginning of year, gross $ 2,263 $ 4,695 $ 4,695
Transfers in 1,384   139
Charge-offs (375) $ (1,302) (1,302)
Sales proceeds (354)   (1,502)
Gain on disposition 72   307
Deferred gain recognized     (73)
Depreciation     (1)
Balance at the end of period, gross 2,990   2,263
Less: valuation allowance (230)   (375)
Balance at the end of period, net $ 2,760   $ 1,888