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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
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Interest income recognized on impaired loans |  |
Average Recorded Investment | $ 60,280 | $ 72,017
Interest Income Recognized | 357 | 413
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 49,131 | 58,970
Interest Income Recognized | 251 | 300
WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 11,149 | 13,047
Interest Income Recognized | 106 | 113
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 30,198 | 33,784
Interest Income Recognized | 35 | 31
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 498 | 227
Interest Income Recognized | 3 | 2
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 8,873 | 14,855
Interest Income Recognized | 104 | 157
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 1,682 | 1,730
Interest Income Recognized | 24 | 24
Construction Loans [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 311 |
Interest Income Recognized | 0 |
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 323 | 710
Interest Income Recognized | 2 | 5
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 181 | 131
Interest Income Recognized | 2 | 2
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 4,421 | 4,254
Interest Income Recognized | 54 | 53
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 7,665 | 9,060
Interest Income Recognized | 64 | 71
Consumer Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 4,952 | 5,280
Interest Income Recognized | 55 | 53
Consumer Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 985 | 1,688
Interest Income Recognized | 12 | 12
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 53 | 87
Interest Income Recognized | 1 | 1
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 138 | 211
Interest Income Recognized | $ 1 | $ 2

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