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Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | $ 5,622 | $ 9,722 | $ 21,829
Current | 1,511,150 | 1,467,039 | 1,322,379
Loans | 1,516,772 | 1,476,761 | 1,344,208
90 Days or More & Accruing | 85 | 1,505 | 3,770
30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 3,054 | 2,916 | 10,758
60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 206 | 2,417 | 750
90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,362 | 4,389 | 10,321
Commercial | Real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 469 | 555 | 4,234
Current | 469,505 | 441,566 | 378,519
Loans | 469,974 | 442,121 | 382,753
90 Days or More & Accruing | 0 | 0 | 22
Commercial | Real estate | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 186 | 139 | 2,935
Commercial | Real estate | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 190 | 2
Commercial | Real estate | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 283 | 226 | 1,297
Commercial | Construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 127 | 93 | 305
Current | 53,267 | 56,472 | 43,608
Loans | 53,394 | 56,565 | 43,913
90 Days or More & Accruing | 0 | 0 | 0
Commercial | Construction | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 47 | 13 | 59
Commercial | Construction | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Commercial | Construction | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 80 | 80 | 246
Commercial | Other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,335 | 2,634 | 5,868
Current | 296,153 | 282,381 | 232,028
Loans | 297,488 | 285,015 | 237,896
90 Days or More & Accruing | 9 | 1,464 | 3,536
Commercial | Other | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 696 | 490 | 1,678
Commercial | Other | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 11 | 62 | 295
Commercial | Other | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 628 | 2,082 | 3,895
Municipal |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Current | 49,476 | 43,783 | 43,537
Loans | 49,476 | 43,783 | 43,537
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 | 111 | 0 | 0
Current | 24,685 | 21,600 | 15,202
Loans | 24,796 | 21,600 | 15,202
90 Days or More & Accruing | 0 | 0 | 0
Residential | Construction | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 111 | 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 | 2,289 | 3,955 | 7,761
Current | 518,028 | 518,115 | 493,210
Loans | 520,317 | 522,070 | 500,971
90 Days or More & Accruing | 71 | 23 | 192
Residential | Term | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,183 | 540 | 4,270
Residential | Term | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 148 | 1,799 | 171
Residential | Term | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 958 | 1,616 | 3,320
Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,000 | 2,336 | 3,311
Current | 76,210 | 77,414 | 87,363
Loans | 77,210 | 79,750 | 90,674
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 | 547 | 1,645 | 1,566
Home equity line of credit | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 45 | 324 | 264
Home equity line of credit | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 408 | 367 | 1,481
Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 291 | 149 | 350
Current | 23,826 | 25,708 | 28,912
Loans | 24,117 | 25,857 | 29,262
90 Days or More & Accruing | 5 | 18 | 20
Consumer | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 284 | 89 | 250
Consumer | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2 | 42 | 18
Consumer | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | $ 5 | $ 18 | $ 82

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