Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]      
Interest income that would have been recognized had impaired loans performed in accordance with their original terms $ 2,575 $ 3,053 $ 4,168
Less: Interest income recognized on impaired loans (1,790) (2,383) (2,683)
Interest foregone on impaired loans $ 785 $ 670 $ 1,485