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Premises and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Depreciation $ 1,257 $ 1,193 $ 1,176
Rent expense $ 540 $ 506 $ 377