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Loans, Allowance for Loan Losses and Credit Quality (Impaired Loans by Portfolio) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 5,055 | $ 5,214 | $ 2,507
Related Allowance | 5,055 | 5,214 |
Impaired Financing Receivable, Recorded Investment, Total | 73,667 | 77,297 |
Impaired Financing Receivable, Unpaid Principal Balance | 77,369 | 81,071 |
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 46,261 | 49,745 |
Unpaid Principal Balance | 48,735 | 52,377 |
Related Allowance | 0 | 0 |
WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 27,406 | 27,552 |
Unpaid Principal Balance | 28,634 | 28,694 |
Commercial and Industrial [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 3,558 | 3,661 | 222
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 28,319 | 28,776 |
Unpaid Principal Balance | 29,280 | 29,772 |
Related Allowance | 0 | 0 |
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 10,119 | 10,402 |
Unpaid Principal Balance | 10,220 | 10,440 |
Commercial Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 173 | 196 | 802
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 9,596 | 11,628 |
Unpaid Principal Balance | 10,742 | 12,891 |
Related Allowance | 0 | 0 |
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 5,170 | 5,185 |
Unpaid Principal Balance | 5,516 | 5,533 |
Construction Loans [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  | 0
Construction Loans [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Related Allowance |  | 0 |
Small Business [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2 | 8 | 3
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 300 | 494 |
Unpaid Principal Balance | 359 | 569 |
Related Allowance | 0 | 0 |
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 446 | 377 |
Unpaid Principal Balance | 462 | 392 |
Residential Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1,066 | 1,086 | 1,223
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 3,640 | 4,216 |
Unpaid Principal Balance | 3,858 | 4,427 |
Related Allowance | 0 | 0 |
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 10,034 | 9,959 |
Unpaid Principal Balance | 10,626 | 10,530 |
Consumer - Home Equity [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 235 | 242 | 231
Consumer - Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 4,289 | 4,485 |
Unpaid Principal Balance | 4,378 | 4,572 |
Related Allowance | 0 | 0 |
Consumer - Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 1,396 | 1,378 |
Unpaid Principal Balance | 1,568 | 1,547 |
Consumer - Other [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 21 | 21 | $ 26
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 117 | 146 |
Unpaid Principal Balance | 118 | 146 |
Related Allowance | 0 | 0 |
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 241 | 251 |
Unpaid Principal Balance | $ 242 | $ 252 |

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