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Loans and Allowance for Credit Losses on Loans (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 3,219,822 | $ 3,095,023 | $ 3,026,222
Pass (Grades 1 – 6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 2,696,045 |
Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 336,401 |
Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 34,859 |
Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 25,568 |
Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 2,150 |
Residential real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,054,798 | 1,070,374 | 992,866
Residential real estate | Pass (Grades 1 – 6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 1,062,825 |
Residential real estate | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 473 |
Residential real estate | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 7,076 |
Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 1,243,397 | 1,269,533
Commercial real estate | Pass (Grades 1 – 6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 1,196,683 |
Commercial real estate | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 31,753 |
Commercial real estate | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 14,961 |
Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 381,494 | 442,701 | 415,436
Commercial | Pass (Grades 1 – 6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 436,537 |
Commercial | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 2,633 |
Commercial | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 3,531 |
Home equity |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 258,573 | 312,779 | 327,763
Home equity | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 310,653 |
Home equity | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 2,126 |
Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 20,392 | 25,772 | $ 20,624
Consumer | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 25,748 |
Consumer | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | $ 24 |

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