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Loans, Allowance for Loan Losses and Credit Quality (Int Inc. Recognized on Impaired Loans by Portfolio) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | $ 44,558 | $ 58,474 | $ 45,318 | $ 59,804
Interest Income Recognized | 385 | 529 | 1,165 | 1,731
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 23,672 | 25,077 | 24,169 | 25,908
Interest Income Recognized | 226 | 194 | 695 | 661
WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 20,886 | 33,397 | 21,149 | 33,896
Interest Income Recognized | 159 | 335 | 470 | 1,070
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 2,444 | 2,080 | 2,584 | 2,204
Interest Income Recognized | 16 | 11 | 48 | 41
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 2,097 | 3,687 | 2,135 | 3,894
Interest Income Recognized | 4 | 10 | 13 | 57
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 11,549 | 13,876 | 11,775 | 14,433
Interest Income Recognized | 115 | 89 | 348 | 337
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 6,854 | 15,830 | 6,977 | 15,993
Interest Income Recognized | 42 | 204 | 126 | 609
Construction Loans [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment |  | 307 |  | 309
Interest Income Recognized |  | 0 |  | 0
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 646 | 465 | 679 | 484
Interest Income Recognized | 5 | 4 | 18 | 14
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 367 | 540 | 384 | 564
Interest Income Recognized | 6 | 7 | 17 | 22
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 4,255 | 3,566 | 4,286 | 3,601
Interest Income Recognized | 42 | 42 | 134 | 123
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 10,004 | 11,698 | 10,071 | 11,764
Interest Income Recognized | 92 | 106 | 272 | 358
Consumer - Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 4,616 | 4,585 | 4,677 | 4,670
Interest Income Recognized | 45 | 44 | 138 | 134
Consumer - Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 1,299 | 1,221 | 1,310 | 1,238
Interest Income Recognized | 13 | 4 | 36 | 13
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 162 | 198 | 168 | 207
Interest Income Recognized | 3 | 4 | 9 | 12
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 265 | 421 | 272 | 443
Interest Income Recognized | $ 2 | $ 4 | $ 6 | $ 11

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