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Accounting for Certain Loans Acquired in a Transfer - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Business Acquisition [Line Items]    
Total provision charged to operating expense $ 532,000 $ 614,000
Loans Purchased With Evidence Of Credit Deterioration [Member]    
Business Acquisition [Line Items]    
Total provision charged to operating expense $ 63,000 $ 105,000