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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | $ 76,414 | $ 44,558 | $ 79,369 | $ 45,318
Interest Income Recognized | 461 | 385 | 1,510 | 1,165
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 58,096 | 23,672 | 60,830 | 24,169
Interest Income Recognized | 277 | 226 | 959 | 695
WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 18,318 | 20,886 | 18,539 | 21,149
Interest Income Recognized | 184 | 159 | 551 | 470
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 33,935 | 2,444 | 36,329 | 2,584
Interest Income Recognized | 18 | 16 | 179 | 48
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 1,698 | 2,097 | 1,768 | 2,135
Interest Income Recognized | 21 | 4 | 65 | 13
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 14,569 | 11,549 | 14,798 | 11,775
Interest Income Recognized | 151 | 115 | 460 | 348
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 4,569 | 6,854 | 4,599 | 6,977
Interest Income Recognized | 65 | 42 | 195 | 126
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 682 | 646 | 702 | 679
Interest Income Recognized | 5 | 5 | 17 | 18
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 305 | 367 | 315 | 384
Interest Income Recognized | 3 | 6 | 11 | 17
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 3,928 | 4,255 | 3,962 | 4,286
Interest Income Recognized | 51 | 42 | 152 | 134
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 9,752 | 10,004 | 9,838 | 10,071
Interest Income Recognized | 79 | 92 | 234 | 272
Consumer Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 4,883 | 4,616 | 4,935 | 4,677
Interest Income Recognized | 50 | 45 | 146 | 138
Consumer Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 1,765 | 1,299 | 1,782 | 1,310
Interest Income Recognized | 14 | 13 | 41 | 36
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 99 | 162 | 104 | 168
Interest Income Recognized | 2 | 3 | 5 | 9
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 229 | 265 | 237 | 272
Interest Income Recognized | $ 2 | $ 2 | $ 5 | $ 6

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