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Loans, Allowance for Loan Losses and Credit Quality (Summary of Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable Impaired [Line Items] |  |
Tdrs Recorded Investment On Nonaccrual Status | $ 5,776 | $ 5,199
Financing Receivable, Recorded Investment, Nonaccrual Status | 50,270 | 57,405
Commercial and Industrial [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 32,556 | 37,455
Commercial Real Estate [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 3,052 | 6,266
Small Business [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 403 | 302
Residential Real Estate [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 8,297 | 7,782
Consumer Home Equity [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 5,903 | 5,553
Consumer - Other [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 59 | $ 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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