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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | $ 89,534 | $ 45,858 | $ 89,849 | $ 46,216
Interest Income Recognized | 399 | 392 | 1,002 | 785
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 70,497 | 24,221 | 70,697 | 24,473
Interest Income Recognized | 230 | 223 | 660 | 447
WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 19,037 | 21,637 | 19,152 | 21,743
Interest Income Recognized | 169 | 169 | 342 | 338
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 49,477 | 2,349 | 49,502 | 2,415
Interest Income Recognized | 19 | 15 | 240 | 30
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 1,521 | 2,458 | 1,555 | 2,487
Interest Income Recognized | 18 | 6 | 37 | 12
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 11,547 | 12,205 | 11,655 | 12,327
Interest Income Recognized | 110 | 103 | 217 | 207
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 5,633 | 6,716 | 5,656 | 6,744
Interest Income Recognized | 56 | 51 | 112 | 102
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 549 | 677 | 559 | 691
Interest Income Recognized | 3 | 5 | 7 | 11
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 316 | 401 | 321 | 410
Interest Income Recognized | 3 | 6 | 7 | 13
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 4,064 | 4,315 | 4,082 | 4,331
Interest Income Recognized | 48 | 51 | 96 | 101
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 9,841 | 10,394 | 9,882 | 10,424
Interest Income Recognized | 77 | 91 | 157 | 184
Consumer - Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 4,746 | 4,537 | 4,781 | 4,567
Interest Income Recognized | 48 | 46 | 96 | 93
Consumer - Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 1,489 | 1,311 | 1,497 | 1,316
Interest Income Recognized | 13 | 13 | 26 | 23
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 114 | 138 | 118 | 142
Interest Income Recognized | 2 | 3 | 4 | 5
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 237 | 357 | 241 | 362
Interest Income Recognized | $ 2 | $ 2 | $ 3 | $ 4

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