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Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Schedule of Financing Receivables [Line Items]
All Past Due	$ 9,557	$ 15,017	$ 12,274
Current	1,442,066	1,282,058	1,236,858
Loans	1,451,623	1,297,075	1,249,132
90 Days or More & Accruing	1,468	1,560	672
30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,618	6,139	4,399
60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,751	2,092	2,529
90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	6,188	6,786	5,346
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
All Past Due	1,258	1,774	1,068
Current	395,897	371,036	358,513
Loans	397,155	372,810	359,581
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	134	786	240
Commercial |    Real estate | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	76	377	0
Commercial |    Real estate | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,048	611	828
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
All Past Due	0	271	15
Current	47,169	37,813	32,770
Loans	47,169	38,084	32,785
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	15
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	0	257	0
Commercial |    Other
Schedule of Financing Receivables [Line Items]
All Past Due	1,924	5,028	2,295
Current	326,043	213,745	203,615
Loans	327,967	218,773	205,910
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	172	2,764	2,031
Commercial |    Other | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	11	465	0
Commercial |    Other | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,741	1,799	264
Municipal
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Current	49,644	41,288	36,113
Loans	49,644	41,288	36,113
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	14,707	14,813	13,239
Loans	14,707	14,813	13,239
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	3,533	4,640	7,279
Current	496,160	487,815	474,070
Loans	499,693	492,455	481,349
90 Days or More & Accruing	0	86	664
Residential |    Term | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	270	1,129	1,079
Residential |    Term | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,413	1,132	2,302
Residential |    Term | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,850	2,379	3,898
Home equity line of credit
Schedule of Financing Receivables [Line Items]
All Past Due	2,581	2,957	1,242
Current	84,438	89,392	93,521
Loans	87,019	92,349	94,763
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	896	1,169	698
Home equity line of credit | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	145	58	197
Home equity line of credit | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,540	1,730	347
Consumer
Schedule of Financing Receivables [Line Items]
All Past Due	261	347	375
Current	28,008	26,156	25,017
Loans	28,269	26,503	25,392
90 Days or More & Accruing	4	10	8
Consumer | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	146	291	336
Consumer | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	106	46	30
Consumer | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	$ 9	$ 10	$ 9

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