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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | $ 68,720 | $ 89,534 | $ 69,656 | $ 89,849
Interest Income Recognized | 413 | 399 | 823 | 1,002
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 56,238 | 70,497 | 57,102 | 70,697
Interest Income Recognized | 300 | 230 | 598 | 660
WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 12,482 | 19,037 | 12,554 | 19,152
Interest Income Recognized | 113 | 169 | 225 | 342
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 32,557 | 49,477 | 33,198 | 49,502
Interest Income Recognized | 34 | 19 | 68 | 240
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 225 | 1,521 | 226 | 1,555
Interest Income Recognized | 2 | 18 | 5 | 37
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 13,018 | 11,547 | 13,131 | 11,655
Interest Income Recognized | 148 | 110 | 295 | 217
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 2,165 | 5,633 | 2,172 | 5,656
Interest Income Recognized | 24 | 56 | 48 | 112
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 672 | 549 | 703 | 559
Interest Income Recognized | 3 | 3 | 8 | 7
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 163 | 316 | 169 | 321
Interest Income Recognized | 3 | 3 | 6 | 7
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 4,825 | 4,064 | 4,842 | 4,082
Interest Income Recognized | 60 | 48 | 119 | 96
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 8,003 | 9,841 | 8,045 | 9,882
Interest Income Recognized | 68 | 77 | 136 | 157
Consumer Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 5,100 | 4,746 | 5,160 | 4,781
Interest Income Recognized | 54 | 48 | 106 | 96
Consumer Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 1,732 | 1,489 | 1,744 | 1,497
Interest Income Recognized | 15 | 13 | 27 | 26
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 66 | 114 | 68 | 118
Interest Income Recognized | 1 | 2 | 2 | 4
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 194 | 237 | 198 | 241
Interest Income Recognized | $ 1 | $ 2 | $ 3 | $ 3

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