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Other Real Estate Owned (OREO) - Summary of Changes in the Balance for OREO (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Real Estate [Abstract]    
Balance at the beginning of year, gross $ 2,903 $ 2,263
Transfers in 37 1,664
Charge-offs (70) (381)
Sales proceeds (698) (717)
Gain on disposition 94 74
Balance at the end of period, gross 2,266 2,903
Less: valuation allowance (154) (224)
Balance at the end of period, net $ 2,112 $ 2,679 [1]
[1] Derived from audited consolidated financial statements.