Quarterly report pursuant to Section 13 or 15(d)

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

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Loans and Leases - Summary of Interest Foregone on Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Receivables [Abstract]        
Interest income that would have been recognized had impaired loans performed in accordance with their original terms $ 696 $ 695 $ 1,934 $ 2,306
Less: Interest income recognized on impaired loans (476) (478) (1,320) (1,766)
Interest foregone on impaired loans $ 220 $ 217 $ 614 $ 540