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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, 2023 | Dec. 31, 2022
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income, Total | $ 4,098,094 | $ 4,010,353
Loans 90 Days Past Due and Accruing | 0 | 0
Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 1,763,378 | 1,700,266
Loans 90 Days Past Due and Accruing | 0 | 0
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 403,901 | 430,131
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 | 240,341 | 234,428
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 | 18,168 | 20,591
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 | 1,370,446 | 1,292,443
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 | 301,860 | 332,494
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 | 3,775 | 2,221
30 – 59 Days Past Due | Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,317 | 852
30 – 59 Days Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,153 | 667
30 – 59 Days Past Due | Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 521 | 357
30 – 59 Days Past Due | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 85 | 23
30 – 59 Days Past Due | Commercial real estate, non owner-occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 44 | 267
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 | 655 | 55
60 – 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,021 | 331
60 – 89 Days Past Due | Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 322 | 186
60 – 89 Days Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,199 | 134
60 – 89 Days Past Due | Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 451 | 0
60 – 89 Days Past Due | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8 | 11
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 | 41 | 0
60 – 89 Days Past Due | Commercial real estate, owner-occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 Days or Greater Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,739 | 1,393
90 Days or Greater Past Due | Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,094 | 524
90 Days or Greater Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,155 | 640
90 Days or Greater Past Due | Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 301 | 171
90 Days or Greater Past Due | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5 | 0
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 | 184 | 11
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 | 0 | 47
Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,535 | 3,945
Total Past Due | Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,733 | 1,562
Total Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,507 | 1,441
Total Past Due | Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,273 | 528
Total Past Due | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 98 | 34
Total Past Due | Commercial real estate, non owner-occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 269 | 278
Total Past Due | Commercial real estate, owner-occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 655 | 102
Current |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,089,559 | 4,006,408
Current | Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,760,645 | 1,698,704
Current | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 400,394 | 428,690
Current | Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 239,068 | 233,900
Current | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 18,070 | 20,557
Current | Commercial real estate, non owner-occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,370,177 | 1,292,165
Current | Commercial real estate, owner-occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 301,205 | $ 332,392

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