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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | $ 65,656 | $ 76,414 | $ 67,456 | $ 79,369
Interest Income Recognized | 397 | 461 | 1,214 | 1,510
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 53,786 | 58,096 | 55,402 | 60,830
Interest Income Recognized | 282 | 277 | 874 | 959
WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 11,870 | 18,318 | 12,054 | 18,539
Interest Income Recognized | 115 | 184 | 340 | 551
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 31,376 | 33,935 | 32,424 | 36,329
Interest Income Recognized | 28 | 18 | 89 | 179
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 324 | 1,698 | 330 | 1,768
Interest Income Recognized | 4 | 21 | 11 | 65
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 12,040 | 14,569 | 12,423 | 14,798
Interest Income Recognized | 135 | 151 | 428 | 460
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 1,701 | 4,569 | 1,715 | 4,599
Interest Income Recognized | 24 | 65 | 71 | 195
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 432 | 682 | 478 | 702
Interest Income Recognized | 4 | 5 | 13 | 17
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 148 | 305 | 154 | 315
Interest Income Recognized | 3 | 3 | 8 | 11
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 4,798 | 3,928 | 4,826 | 3,962
Interest Income Recognized | 56 | 51 | 173 | 152
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 8,057 | 9,752 | 8,194 | 9,838
Interest Income Recognized | 69 | 79 | 207 | 234
Consumer Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 5,078 | 4,883 | 5,185 | 4,935
Interest Income Recognized | 58 | 50 | 168 | 146
Consumer Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 1,453 | 1,765 | 1,467 | 1,782
Interest Income Recognized | 14 | 14 | 39 | 41
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 62 | 99 | 66 | 104
Interest Income Recognized | 1 | 2 | 3 | 5
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 187 | 229 | 194 | 237
Interest Income Recognized | $ 1 | $ 2 | $ 4 | $ 5

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