Quarterly report pursuant to Section 13 or 15(d)

Loans - Summary of Interest Foregone on Impaired Loans (Detail)

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Loans - Summary of Interest Foregone on Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Receivables [Abstract]        
Interest income that would have been recognized had impaired loans performed in accordance with their original terms $ 1,444 $ 1,063 $ 3,361 $ 3,490
Less: Interest income recognized on impaired loans (643) (796) (2,153) (2,353)
Interest foregone on impaired loans $ 801 $ 267 $ 1,208 $ 1,137