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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) contract | Jun. 30, 2017 USD ($) contract | Jun. 30, 2018 USD ($) contract | Jun. 30, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 5 | 25 |  | 8 | 37
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 379 | $ 4,110 |  | $ 1,066 | $ 5,407
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 379 | $ 4,124 | [1] | $ 1,066 | $ 5,421
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 6 |  |  | 8
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 1,299 |  |  | $ 1,379
Financing Receivable, Modifications, Post-Modification Recorded Investment |  | $ 1,299 | [1] |  | $ 1,379
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 0 | 2 |  | 1 | 6
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 0 | $ 950 |  | $ 445 | $ 1,884
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 950 | [1] | $ 445 | $ 1,884
Small Business [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 4 |  |  | 8
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 121 |  |  | $ 264
Financing Receivable, Modifications, Post-Modification Recorded Investment |  | $ 121 | [1] |  | $ 264
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 1 | 5 |  | 1 | 5
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 149 | $ 889 |  | $ 149 | $ 889
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 149 | $ 900 |  | $ 149 | $ 900
Consumer Home Equity [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 4 | 8 |  | 6 | 10
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 230 | $ 851 |  | $ 472 | $ 991
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 230 | $ 854 | [1] | $ 472 | $ 994
[1] | The post-modification balances represent the legal principal balance of the loan on the date of modification. These amounts may show an increase when modifications include a capitalization of interest.

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