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Loans and Leases - Summary of Interest Foregone on Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition Loans and leases receivable impaired interest income not recognized. + References No definition available. + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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