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Loans, Allowance for Loan Losses and Credit Quality (Summary of Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable Impaired [Line Items] |  |  |
Tdrs Recorded Investment On Nonaccrual Status |  | $ 3,370 | $ 6,067
Financing Receivable, Recorded Investment, Nonaccrual Status | [1] | 45,385 | 49,630
Commercial and Industrial [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 28,742 | 32,055
Commercial Real Estate [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 1,960 | 3,123
Small Business [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 191 | 230
Residential Real Estate [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 8,076 | 8,129
Consumer Home Equity [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 6,367 | 6,022
Consumer - Other [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | $ 49 | $ 71
[1] | (1)Included in these amounts were $3.4 million and $6.1 million of nonaccruing TDRs at September 30, 2018 and December 31, 2017, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -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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