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Loans, Allowance for Loan Losses and Credit Quality (Impaired Loans by Portfolio) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 837 | $ 980
Related Allowance |  | 980
Impaired Financing Receivable, Recorded Investment, Total |  | 49,628
Impaired Financing Receivable, Unpaid Principal Balance |  | 68,140
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 39,242
Unpaid Principal Balance |  | 56,605
Related Allowance |  | 0
WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 10,386
Unpaid Principal Balance |  | 11,535
Commercial and Industrial [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 6 | 126
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 23,786
Unpaid Principal Balance |  | 34,970
Related Allowance |  | 0
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 670
Unpaid Principal Balance |  | 670
Commercial Real Estate [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 41 | 48
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 6,213
Unpaid Principal Balance |  | 12,101
Related Allowance |  | 0
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 2,124
Unpaid Principal Balance |  | 2,124
Construction Loans [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |
Small Business [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 11 | 8
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 469
Unpaid Principal Balance |  | 484
Related Allowance |  | 0
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 68
Unpaid Principal Balance |  | 105
Residential Real Estate [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 619 | 637
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 4,976
Unpaid Principal Balance |  | 5,123
Related Allowance |  | 0
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 6,252
Unpaid Principal Balance |  | 7,163
Consumer Home Equity [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 155 | 156
Consumer Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 3,764
Unpaid Principal Balance |  | 3,893
Related Allowance |  | 0
Consumer Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 1,184
Unpaid Principal Balance |  | 1,382
Consumer - Other [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 5 | 5
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 34
Unpaid Principal Balance |  | 34
Related Allowance |  | 0
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment |  | 88
Unpaid Principal Balance |  | $ 91

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