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Loans, Allowance for Loan Losses and Credit Quality (Summary of Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable Impaired [Line Items] |  |  |
Tdrs Recorded Investment On Nonaccrual Status |  | $ 26,232 | $ 29,348
Financing Receivable, Nonaccrual | [1] | 43,360 | 45,413
Commercial and Industrial [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Nonaccrual |  | 23,507 | 26,310
Commercial Real Estate [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Nonaccrual |  | 1,666 | 3,015
Construction Loans [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Nonaccrual |  | 0 | 311
Small Business [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Nonaccrual |  | 112 | 235
Residential Real Estate [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Nonaccrual |  | 11,281 | 8,251
Consumer Home Equity [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Nonaccrual |  | 6,720 | 7,278
Consumer - Other [Member] |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Financing Receivable, Nonaccrual |  | $ 74 | $ 13
[1] | (1)Included in these amounts were $26.2 million and $29.3 million of nonaccruing TDRs at September 30, 2019 and December 31, 2018, respectively.

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