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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
--- | ---
Mar. 31, 2019 USD ($) contract | Mar. 31, 2018 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 2 | 3
TROUBLED DEBT RESTRUCTURINGS: |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 225 | $ 687
Financing Receivable, Modifications, Post-Modification Recorded Investment | [1] | $ 225 | $ 687
Commercial Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 1 | 1
TROUBLED DEBT RESTRUCTURINGS: |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 150 | $ 445
Financing Receivable, Modifications, Post-Modification Recorded Investment | [1] | $ 150 | $ 445
Consumer Home Equity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 1 | 2
TROUBLED DEBT RESTRUCTURINGS: |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 75 | $ 242
Financing Receivable, Modifications, Post-Modification Recorded Investment | [1] | $ 75 | $ 242
[1] |

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