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Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Schedule of Financing Receivables [Line Items]
Loans	$ 1,617,212	$ 1,476,761	$ 1,436,646
90+ Days & Accruing	229	1,505	1,494
30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	1,028	2,916	6,581
60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	1,519	2,417	766
90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	1,571	4,389	5,429
All Past Due
Schedule of Financing Receivables [Line Items]
Loans	4,118	9,722	12,776
Current
Schedule of Financing Receivables [Line Items]
Loans	1,613,094	1,467,039	1,423,870
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
Loans	550,077	442,121	407,128
90+ Days & Accruing	36	0	0
Commercial |    Real estate | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	33	139	2,397
Commercial |    Real estate | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	190	58
Commercial |    Real estate | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	226	226	454
Commercial |    Real estate | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	259	555	2,909
Commercial |    Real estate | Current
Schedule of Financing Receivables [Line Items]
Loans	549,818	441,566	404,219
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
Loans	73,302	56,565	52,038
90+ Days & Accruing	0	0	0
Commercial |    Construction | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	13	13	0
Commercial |    Construction | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	15	0	0
Commercial |    Construction | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	80	80
Commercial |    Construction | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	28	93	80
Commercial |    Construction | Current
Schedule of Financing Receivables [Line Items]
Loans	73,274	56,472	51,958
Commercial |    Other
Schedule of Financing Receivables [Line Items]
Loans	288,121	285,015	309,297
90+ Days & Accruing	0	1,464	1,464
Commercial |    Other | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	92	490	547
Commercial |    Other | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	359	62	258
Commercial |    Other | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	225	2,082	1,871
Commercial |    Other | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	676	2,634	2,676
Commercial |    Other | Current
Schedule of Financing Receivables [Line Items]
Loans	287,445	282,381	306,621
Municipal
Schedule of Financing Receivables [Line Items]
Loans	40,616	43,783	44,110
90+ Days & Accruing	0	0	0
Municipal | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Municipal | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Municipal | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Municipal | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Municipal | Current
Schedule of Financing Receivables [Line Items]
Loans	40,616	43,783	44,110
Residential |    Construction
Schedule of Financing Receivables [Line Items]
Loans	29,358	21,600	16,101
90+ Days & Accruing	0	0	0
Residential |    Construction | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Residential |    Construction | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Residential |    Construction | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Residential |    Construction | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Residential |    Construction | Current
Schedule of Financing Receivables [Line Items]
Loans	29,358	21,600	16,101
Residential |    Term
Schedule of Financing Receivables [Line Items]
Loans	537,811	522,070	497,667
90+ Days & Accruing	190	23	0
Residential |    Term | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	549	540	2,550
Residential |    Term | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	918	1,799	357
Residential |    Term | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	986	1,616	1,602
Residential |    Term | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	2,453	3,955	4,509
Residential |    Term | Current
Schedule of Financing Receivables [Line Items]
Loans	535,358	518,115	493,158
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Loans	74,594	79,750	82,982
90+ Days & Accruing	0	0	0
Home equity line of credit | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	251	1,645	868
Home equity line of credit | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	25	324	65
Home equity line of credit | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	131	367	1,392
Home equity line of credit | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	407	2,336	2,325
Home equity line of credit | Current
Schedule of Financing Receivables [Line Items]
Loans	74,187	77,414	80,657
Consumer
Schedule of Financing Receivables [Line Items]
Loans	23,333	25,857	27,323
90+ Days & Accruing	3	18	30
Consumer | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	90	89	219
Consumer | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	202	42	28
Consumer | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	3	18	30
Consumer | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	295	149	277
Consumer | Current
Schedule of Financing Receivables [Line Items]
Loans	$ 23,038	$ 25,708	$ 27,046

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