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Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | $ 12,776 | $ 15,017 | $ 9,814
Current | 1,423,870 | 1,282,058 | 1,253,645
Loans | 1,436,646 | 1,297,075 | 1,263,459
90 Days or More & Accruing | 1,494 | 1,560 | 18
30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 6,581 | 6,139 | 1,931
60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 766 | 2,092 | 2,191
90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 5,429 | 6,786 | 5,692
Commercial | Real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,909 | 1,774 | 1,199
Current | 404,219 | 371,036 | 366,966
Loans | 407,128 | 372,810 | 368,165
90 Days or More & Accruing | 0 | 0 | 0
Commercial | Real estate | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,397 | 786 | 305
Commercial | Real estate | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 58 | 377 | 233
Commercial | Real estate | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 454 | 611 | 661
Commercial | Construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 80 | 271 | 293
Current | 51,958 | 37,813 | 36,949
Loans | 52,038 | 38,084 | 37,242
90 Days or More & Accruing | 0 | 0 | 0
Commercial | Construction | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 14
Commercial | Construction | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 14 | 279
Commercial | Construction | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 80 | 257 | 0
Commercial | Other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,676 | 5,028 | 663
Current | 306,621 | 213,745 | 201,196
Loans | 309,297 | 218,773 | 201,859
90 Days or More & Accruing | 1,464 | 1,464 | 0
Commercial | Other | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 547 | 2,764 | 35
Commercial | Other | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 258 | 465 | 289
Commercial | Other | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,871 | 1,799 | 339
Municipal |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Current | 44,110 | 41,288 | 36,522
Loans | 44,110 | 41,288 | 36,522
90 Days or More & Accruing | 0 | 0 | 0
Municipal | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Municipal | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Municipal | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Residential | Construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Current | 16,101 | 14,813 | 14,118
Loans | 16,101 | 14,813 | 14,118
90 Days or More & Accruing | 0 | 0 | 0
Residential | Construction | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Residential | Construction | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Residential | Construction | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Residential | Term |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 4,509 | 4,640 | 5,223
Current | 493,158 | 487,815 | 480,267
Loans | 497,667 | 492,455 | 485,490
90 Days or More & Accruing | 0 | 86 | 0
Residential | Term | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,550 | 1,129 | 650
Residential | Term | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 357 | 1,132 | 767
Residential | Term | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,602 | 2,379 | 3,806
Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,325 | 2,957 | 1,867
Current | 80,657 | 89,392 | 92,277
Loans | 82,982 | 92,349 | 94,144
90 Days or More & Accruing | 0 | 0 | 0
Home equity line of credit | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 868 | 1,169 | 693
Home equity line of credit | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 65 | 58 | 306
Home equity line of credit | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,392 | 1,730 | 868
Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 277 | 347 | 569
Current | 27,046 | 26,156 | 25,350
Loans | 27,323 | 26,503 | 25,919
90 Days or More & Accruing | 30 | 10 | 18
Consumer | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 219 | 291 | 234
Consumer | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 28 | 46 | 317
Consumer | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | $ 30 | $ 10 | $ 18

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