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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | $ 3,431,474 | $ 3,219,822 | $ 3,095,023
Loans 90 Days Past Due and Accruing | 0 | 0 |
Residential real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 1,306,447 | 1,054,798 | 1,070,374
Loans 90 Days Past Due and Accruing | 0 | 0 |
Commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total |  |  | 1,243,397
Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 363,695 | 381,494 | 442,701
Loans 90 Days Past Due and Accruing | 0 | 0 |
Home equity |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 210,403 | 258,573 | 312,779
Loans 90 Days Past Due and Accruing | 0 | 0 |
Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 19,516 | 20,392 | $ 25,772
Loans 90 Days Past Due and Accruing | 0 | 0 |
SBA PPP Portfolio Segment |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 35,953 | 135,095 |
Loans 90 Days Past Due and Accruing | 0 | 0 |
Commercial real estate, non owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 1,178,185 | 1,097,975 |
Loans 90 Days Past Due and Accruing | 0 | 0 |
Commercial real estate, owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 317,275 | 271,495 |
Loans 90 Days Past Due and Accruing | 0 | 0 |
30 – 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,259 | 2,362 |
30 – 59 Days Past Due | Residential real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 379 | 1,406 |
30 – 59 Days Past Due | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 282 | 430 |
30 – 59 Days Past Due | Home equity |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 456 | 335 |
30 – 59 Days Past Due | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 95 | 92 |
30 – 59 Days Past Due | Commercial real estate, owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 47 | 99 |
60 – 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 768 | 1,393 |
60 – 89 Days Past Due | Residential real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 475 | 1,103 |
60 – 89 Days Past Due | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 174 |  |
60 – 89 Days Past Due | Home equity |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 50 | 173 |
60 – 89 Days Past Due | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 1 | 67 |
60 – 89 Days Past Due | SBA PPP Portfolio Segment |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 68 |  |
60 – 89 Days Past Due | Commercial real estate, non owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 50 |
90 Days or Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,658 | 5,032 |
90 Days or Greater Past Due | Residential real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,210 | 2,535 |
90 Days or Greater Past Due | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 787 | 857 |
90 Days or Greater Past Due | Home equity |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 445 | 1,416 |
90 Days or Greater Past Due | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 32 | 4 |
90 Days or Greater Past Due | Commercial real estate, non owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 51 | 173 |
90 Days or Greater Past Due | Commercial real estate, owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 133 | 47 |
Total Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,685 | 8,787 |
Total Past Due | Residential real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,064 | 5,044 |
Total Past Due | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,243 | 1,287 |
Total Past Due | Home equity |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 951 | 1,924 |
Total Past Due | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 128 | 163 |
Total Past Due | SBA PPP Portfolio Segment |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 68 |  |
Total Past Due | Commercial real estate, non owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 51 | 223 |
Total Past Due | Commercial real estate, owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 180 | 146 |
Current |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 3,426,789 | 3,211,035 |
Current | Residential real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,304,383 | 1,049,754 |
Current | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 362,452 | 380,207 |
Current | Home equity |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 209,452 | 256,649 |
Current | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 19,388 | 20,229 |
Current | SBA PPP Portfolio Segment |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 35,885 | 135,095 |
Current | Commercial real estate, non owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,178,134 | 1,097,752 |
Current | Commercial real estate, owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 317,095 | $ 271,349 |

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