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Loans and Allowance for Credit Losses on Loans (Loan Aging Analysis by Portfolio Segment (Including Loans Past Due Over Ninety Days and Non Accrual Loans) and Summary of Non Accrual Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 8,787 | $ 12,089 |
Current | 3,211,035 | 3,082,934 |
Total loan balances | 3,219,822 | 3,095,023 | $ 3,026,222
Residential real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 5,044 | 5,522 |
Current | 1,049,754 | 1,064,852 |
Total loan balances | 1,054,798 | 1,070,374 | 992,866
Commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due |  | 2,531 |
Current |  | 1,240,866 |
Total loan balances |  | 1,243,397 | 1,269,533
Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,287 | 1,496 |
Current | 380,207 | 441,205 |
Total loan balances | 381,494 | 442,701 | 415,436
Home equity |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,924 | 2,378 |
Current | 256,649 | 310,401 |
Total loan balances | 258,573 | 312,779 | 327,763
Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 163 | 162 |
Current | 20,229 | 25,610 |
Total loan balances | 20,392 | 25,772 | $ 20,624
Commercial Real Estate - Non-Owner Occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 223 |  |
Current | 1,097,752 |  |
Total loan balances | 1,097,975 |  |
Commercial Real Estate - Owner Occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 146 |  |
Current | 271,349 |  |
Total loan balances | 271,495 |  |
SBA PPP Portfolio Segment |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 135,095 |  |
Total loan balances | 135,095 |  |
30 – 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 2,362 | 3,901 |
30 – 59 Days Past Due | Residential real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,406 | 2,297 |
30 – 59 Days Past Due | Commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due |  | 267 |
30 – 59 Days Past Due | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 430 | 548 |
30 – 59 Days Past Due | Home equity |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 335 | 681 |
30 – 59 Days Past Due | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 92 | 108 |
30 – 59 Days Past Due | Commercial Real Estate - Owner Occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 99 |  |
60 – 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,393 | 2,859 |
60 – 89 Days Past Due | Residential real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,103 | 627 |
60 – 89 Days Past Due | Commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due |  | 1,720 |
60 – 89 Days Past Due | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due |  | 243 |
60 – 89 Days Past Due | Home equity |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 173 | 238 |
60 – 89 Days Past Due | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 67 | 31 |
60 – 89 Days Past Due | Commercial Real Estate - Non-Owner Occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 50 |  |
90 Days or Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 5,032 | 5,329 |
90 Days or Greater Past Due | Residential real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 2,535 | 2,598 |
90 Days or Greater Past Due | Commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due |  | 544 |
90 Days or Greater Past Due | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 857 | 705 |
90 Days or Greater Past Due | Home equity |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,416 | 1,459 |
90 Days or Greater Past Due | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 4 | $ 23 |
90 Days or Greater Past Due | Commercial Real Estate - Non-Owner Occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 173 |  |
90 Days or Greater Past Due | Commercial Real Estate - Owner Occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 47 |  |

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