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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | $ 54,648 | $ 68,720 | $ 56,449 | $ 69,656
Interest Income Recognized | 341 | 413 | 683 | 823
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 44,717 | 56,238 | 46,427 | 57,102
Interest Income Recognized | 240 | 300 | 483 | 598
WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 9,931 | 12,482 | 10,022 | 12,554
Interest Income Recognized | 101 | 113 | 200 | 225
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 27,406 | 32,557 | 28,971 | 33,198
Interest Income Recognized | 34 | 34 | 70 | 68
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 268 | 225 | 270 | 226
Interest Income Recognized | 3 | 2 | 6 | 5
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 7,496 | 13,018 | 7,582 | 13,131
Interest Income Recognized | 92 | 148 | 186 | 295
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 1,662 | 2,165 | 1,672 | 2,172
Interest Income Recognized | 24 | 24 | 49 | 48
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 309 | 672 | 319 | 703
Interest Income Recognized | 2 | 3 | 6 | 8
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 190 | 163 | 192 | 169
Interest Income Recognized | 2 | 3 | 5 | 6
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 4,713 | 4,825 | 4,727 | 4,842
Interest Income Recognized | 58 | 60 | 113 | 119
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 6,707 | 8,003 | 6,775 | 8,045
Interest Income Recognized | 59 | 68 | 116 | 136
Consumer Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 4,751 | 5,100 | 4,783 | 5,160
Interest Income Recognized | 53 | 54 | 107 | 106
Consumer Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 972 | 1,732 | 978 | 1,744
Interest Income Recognized | 11 | 15 | 22 | 27
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 42 | 66 | 45 | 68
Interest Income Recognized | 1 | 1 | 1 | 2
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |  |  |
Interest income recognized on impaired loans |  |  |  |
Average Recorded Investment | 132 | 194 | 135 | 198
Interest Income Recognized | $ 2 | $ 1 | $ 2 | $ 3

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