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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | $ 57,363 | $ 65,656 | $ 60,120 | $ 67,456
Interest Income Recognized | 392 | 397 | 1,214 | 1,214
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 48,403 | 53,786 | 51,047 | 55,402
Interest Income Recognized | 295 | 282 | 924 | 874
WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 8,960 | 11,870 | 9,073 | 12,054
Interest Income Recognized | 97 | 115 | 290 | 340
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 25,694 | 31,376 | 27,937 | 32,424
Interest Income Recognized | 35 | 28 | 108 | 89
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 353 | 324 | 360 | 330
Interest Income Recognized | 4 | 4 | 13 | 11
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 12,987 | 12,040 | 13,261 | 12,423
Interest Income Recognized | 149 | 135 | 478 | 428
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 1,402 | 1,701 | 1,415 | 1,715
Interest Income Recognized | 20 | 24 | 60 | 71
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 235 | 432 | 266 | 478
Interest Income Recognized | 3 | 4 | 10 | 13
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 92 | 148 | 95 | 154
Interest Income Recognized | 0 | 3 | 2 | 8
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 5,031 | 4,798 | 5,061 | 4,826
Interest Income Recognized | 57 | 56 | 175 | 173
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 6,047 | 8,057 | 6,115 | 8,194
Interest Income Recognized | 61 | 69 | 179 | 207
Consumer Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 4,417 | 5,078 | 4,479 | 5,185
Interest Income Recognized | 50 | 58 | 151 | 168
Consumer Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 959 | 1,453 | 972 | 1,467
Interest Income Recognized | 11 | 14 | 33 | 39
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 39 | 62 | 43 | 66
Interest Income Recognized | 1 | 1 | 2 | 3
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 107 | 187 | 116 | 194
Interest Income Recognized | $ 1 | $ 1 | $ 3 | $ 4

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