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 ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Receivables [Abstract]        
Interest income that would have been recognized had impaired loans performed in accordance with their original terms $ 678,000 $ 622,000 $ 1,332,000 $ 1,213,000
Less: Interest income recognized on impaired loans (382,000) (442,000) (749,000) (819,000)
Interest foregone on impaired loans $ 296,000 $ 180,000 $ 583,000 $ 394,000