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Loans, Allowance for Loan Losses and Credit Quality (Modifications which occurred during the period & change in recorded investment) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) contract | Sep. 30, 2016 USD ($) contract | Sep. 30, 2017 USD ($) contract | Sep. 30, 2016 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 7 | 8 | 44 | 37
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 815 | $ 1,373 | $ 6,222 | $ 4,931
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 815 | $ 1,373 | $ 6,236 | $ 4,973
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 1 | 0 | 9 | 7
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 196 | $ 0 | $ 1,575 | $ 528
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 196 | $ 0 | $ 1,575 | $ 528
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 0 | 3 | 6 | 9
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 0 | $ 986 | $ 1,884 | $ 2,329
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 986 | $ 1,884 | $ 2,329
Small Business [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 2 | 1 | 10 | 3
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 183 | $ 59 | $ 447 | $ 168
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 183 | $ 59 | $ 447 | $ 168
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 0 | 0 | 5 | 5
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 0 | $ 0 | $ 889 | $ 1,167
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 0 | $ 900 | $ 1,209
Consumer Home Equity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 4 | 4 | 14 | 8
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 436 | $ 328 | $ 1,427 | $ 632
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 436 | $ 328 | $ 1,430 | $ 632
Consumer - Other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 0 |  | 5
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 0 |  | $ 107
Financing Receivable, Modifications, Post-Modification Recorded Investment |  | $ 0 |  | $ 107

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