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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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