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Loans, Allowance for Loan Losses and Credit Quality (Impaired Loans by Portfolio) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 1,073 | $ 1,079 | $ 1,187
Related Allowance | 1,073 | 1,079 |
Impaired Financing Receivable, Recorded Investment, Total | 54,163 | 59,060 |
Impaired Financing Receivable, Unpaid Principal Balance | 66,217 | 68,514 |
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 44,300 | 47,900 |
Unpaid Principal Balance | 55,042 | 56,125 |
Related Allowance | 0 | 0 |
WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 9,863 | 11,160 |
Unpaid Principal Balance | 11,175 | 12,389 |
Commercial and Industrial [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 7 | 7 | 8
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 27,085 | 28,459 |
Unpaid Principal Balance | 37,169 | 35,913 |
Related Allowance | 0 | 0 |
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 266 | 370 |
Unpaid Principal Balance | 266 | 370 |
Commercial Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 74 | 37 | 74
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 7,414 | 9,552 |
Unpaid Principal Balance | 7,634 | 9,832 |
Related Allowance | 0 | 0 |
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 1,655 | 1,287 |
Unpaid Principal Balance | 1,655 | 1,287 |
Construction Loans [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  | 0
Small Business [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 38 | 1 | 1
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 342 | 358 |
Unpaid Principal Balance | 389 | 439 |
Related Allowance | 0 | 0 |
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 188 | 183 |
Unpaid Principal Balance | 229 | 223 |
Residential Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 789 | 862 | 859
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 4,694 | 4,518 |
Unpaid Principal Balance | 4,831 | 4,686 |
Related Allowance | 0 | 0 |
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 6,657 | 8,188 |
Unpaid Principal Balance | 7,765 | 9,217 |
Consumer Home Equity [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 159 | 164 | 231
Consumer Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 4,723 | 4,957 |
Unpaid Principal Balance | 4,976 | 5,199 |
Related Allowance | 0 | 0 |
Consumer Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 966 | 991 |
Unpaid Principal Balance | 1,127 | 1,149 |
Consumer - Other [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 6 | 8 | $ 14
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 42 | 56 |
Unpaid Principal Balance | 43 | 56 |
Related Allowance | 0 | 0 |
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 131 | 141 |
Unpaid Principal Balance | $ 133 | $ 143 |

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