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Summary of Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Financing Receivable Impaired [Line Items] |  |
TDRs on nonaccrual status | $ 6,067 | $ 5,199
Financing Receivable, Recorded Investment, Nonaccrual Status | 49,630 | 57,405
Commercial and Industrial [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 32,055 | 37,455
Commercial Real Estate [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 3,123 | 6,266
Small Business [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 230 | 302
Residential Real Estate [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 8,129 | 7,782
Home Equity [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 6,022 | 5,553
Consumer Portfolio Segment [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 71 | $ 47

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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