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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, 2017 | Mar. 31, 2016
Interest income recognized on impaired loans |  |
Average Recorded Investment | $ 84,817 | $ 49,792
Interest Income Recognized | 550 | 440
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 57,289 | 26,945
Interest Income Recognized | 391 | 252
WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 27,528 | 22,847
Interest Income Recognized | 159 | 188
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 39,193 | 2,871
Interest Income Recognized | 208 | 17
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 10,178 | 2,090
Interest Income Recognized | 4 | 4
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 9,678 | 15,093
Interest Income Recognized | 91 | 137
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 5,189 | 8,024
Interest Income Recognized | 50 | 69
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 304 | 478
Interest Income Recognized | 3 | 4
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 457 | 484
Interest Income Recognized | 5 | 8
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 3,671 | 3,639
Interest Income Recognized | 43 | 43
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 10,057 | 10,528
Interest Income Recognized | 85 | 94
Consumer - Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 4,323 | 4,718
Interest Income Recognized | 44 | 48
Consumer - Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 1,402 | 1,323
Interest Income Recognized | 13 | 10
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 120 | 146
Interest Income Recognized | 2 | 3
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Interest income recognized on impaired loans |  |
Average Recorded Investment | 245 | 398
Interest Income Recognized | $ 2 | $ 3

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 + Details
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