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
Mar. 31, 2018
Mar. 31, 2017
Receivables [Abstract]    
Interest income that would have been recognized had impaired loans performed in accordance with their original terms $ 654 $ 591
Less: Interest income recognized on impaired loans (367) (376)
Interest foregone on impaired loans $ 287 $ 215