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Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | $ 21,829 | $ 15,017 | $ 11,280
Current | 1,322,379 | 1,282,058 | 1,253,359
Total | 1,344,208 | 1,297,075 | 1,264,639
90 Days or More & Accruing | 3,770 | 1,560 | 4
30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 10,758 | 6,139 | 6,048
60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 750 | 2,092 | 2,215
90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 10,321 | 6,786 | 3,017
Commercial | Real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 4,234 | 1,774 | 1,728
Current | 378,519 | 371,036 | 356,032
Total | 382,753 | 372,810 | 357,760
90 Days or More & Accruing | 22 | 0 | 0
Commercial | Real estate | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,935 | 786 | 282
Commercial | Real estate | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2 | 377 | 825
Commercial | Real estate | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,297 | 611 | 621
Commercial | Construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 305 | 271 | 333
Current | 43,608 | 37,813 | 33,898
Total | 43,913 | 38,084 | 34,231
90 Days or More & Accruing | 0 | 0 | 0
Commercial | Construction | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 59 | 0 | 47
Commercial | Construction | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 14 | 0
Commercial | Construction | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 246 | 257 | 286
Commercial | Other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 5,868 | 5,028 | 1,030
Current | 232,028 | 213,745 | 204,432
Total | 237,896 | 218,773 | 205,462
90 Days or More & Accruing | 3,536 | 1,464 | 0
Commercial | Other | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,678 | 2,764 | 664
Commercial | Other | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 295 | 465 | 63
Commercial | Other | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 3,895 | 1,799 | 303
Municipal |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Current | 43,537 | 41,288 | 54,246
Total | 43,537 | 41,288 | 54,246
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 | 15,202 | 14,813 | 18,450
Total | 15,202 | 14,813 | 18,450
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 | 7,761 | 4,640 | 5,246
Current | 493,210 | 487,815 | 468,995
Total | 500,971 | 492,455 | 474,241
90 Days or More & Accruing | 192 | 86 | 0
Residential | Term | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 4,270 | 1,129 | 2,659
Residential | Term | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 171 | 1,132 | 1,153
Residential | Term | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 3,320 | 2,379 | 1,434
Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 3,311 | 2,957 | 2,365
Current | 87,363 | 89,392 | 93,327
Total | 90,674 | 92,349 | 95,692
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 | 1,566 | 1,169 | 1,985
Home equity line of credit | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 264 | 58 | 11
Home equity line of credit | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,481 | 1,730 | 369
Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 350 | 347 | 578
Current | 28,912 | 26,156 | 23,979
Total | 29,262 | 26,503 | 24,557
90 Days or More & Accruing | 20 | 10 | 4
Consumer | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 250 | 291 | 411
Consumer | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 18 | 46 | 163
Consumer | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | $ 82 | $ 10 | $ 4

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