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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 | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) contract | Sep. 30, 2015 USD ($) contract | Sep. 30, 2016 USD ($) contract | Dec. 31, 2015 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 8 | 7 | 37 | 32
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 1,373 | $ 1,110 | $ 4,931 | $ 5,012
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 1,373 | $ 1,137 | $ 4,973 | $ 5,039
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 0 | 1 | 7 | 10
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 0 | $ 100 | $ 528 | $ 1,153
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 100 | $ 528 | $ 1,153
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 3 | 1 | 9 | 6
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 986 | $ 653 | $ 2,329 | $ 2,963
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 986 | $ 653 | $ 2,329 | $ 2,963
Small Business [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 1 | 2 | 3 | 7
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 59 | $ 103 | $ 168 | $ 269
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 59 | $ 103 | $ 168 | $ 269
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 0 | 2 | 5 | 5
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 0 | $ 218 | $ 1,167 | $ 376
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 245 | $ 1,209 | $ 403
Consumer - Home Equity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 4 | 1 | 8 | 4
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 328 | $ 36 | $ 632 | $ 251
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 328 | $ 36 | $ 632 | $ 251
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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