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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Receivables [Abstract]        
Interest income that would have been recognized had impaired loans performed in accordance with their original terms $ 622 $ 718 $ 1,213 $ 1,611
Less: Interest income recognized on impaired loans (442) (598) (819) (1,287)
Interest foregone on impaired loans $ 180 $ 120 $ 394 $ 324