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Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Schedule of Financing Receivables [Line Items]
All Past Due	$ 9,814	$ 13,375	$ 10,373
Current	1,253,645	1,224,908	1,233,185
Total	1,263,459	1,238,283	1,243,558
90 Days or More & Accruing	18	351	249
30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,931	5,958	3,627
60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	2,191	3,977	3,644
90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	5,692	3,440	3,102
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
All Past Due	1,199	2,051	808
Current	366,966	351,192	365,582
Total	368,165	353,243	366,390
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	305	1,274	305
Commercial | Real estate | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	233	0	0
Commercial | Real estate | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	661	777	503
Commercial | Construction
Schedule of Financing Receivables [Line Items]
All Past Due	293	10	0
Current	36,949	27,294	23,889
Total	37,242	27,304	23,889
90 Days or More & Accruing	0	0	0
Commercial | Construction | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	14	0	0
Commercial | Construction | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	279	10	0
Commercial | Construction | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Commercial | Other
Schedule of Financing Receivables [Line Items]
All Past Due	663	580	1,382
Current	201,196	195,811	186,746
Total	201,859	196,391	188,128
90 Days or More & Accruing	0	0	0
Commercial | Other | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	35	455	440
Commercial | Other | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	289	5	526
Commercial | Other | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	339	120	416
Municipal
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Current	36,522	51,128	56,704
Total	36,522	51,128	56,704
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	76	0
Current	14,118	17,667	18,166
Total	14,118	17,743	18,166
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	76	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	5,223	6,638	5,105
Current	480,267	462,507	454,344
Total	485,490	469,145	459,449
90 Days or More & Accruing	0	339	199
Residential | Term | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	650	1,097	838
Residential | Term | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	767	3,518	2,701
Residential | Term | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	3,806	2,023	1,566
Home equity line of credit
Schedule of Financing Receivables [Line Items]
All Past Due	1,867	3,731	2,851
Current	92,277	94,738	102,362
Total	94,144	98,469	105,213
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	693	2,819	1,883
Home equity line of credit | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	306	419	403
Home equity line of credit | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	868	493	565
Consumer
Schedule of Financing Receivables [Line Items]
All Past Due	569	289	227
Current	25,350	24,571	25,392
Total	25,919	24,860	25,619
90 Days or More & Accruing	18	12	50
Consumer | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	234	237	161
Consumer | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	317	25	14
Consumer | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	$ 18	$ 27	$ 52

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