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Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Schedule of Financing Receivables [Line Items]
All Past Due	$ 12,274	$ 13,375	$ 7,438
Current	1,236,858	1,224,908	1,217,002
Total	1,249,132	1,238,283	1,224,440
90 Days or More & Accruing	672	351	3
30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	4,399	5,958	2,112
60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	2,529	3,977	2,206
90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	5,346	3,440	3,120
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
All Past Due	1,068	2,051	715
Current	358,513	351,192	349,399
Total	359,581	353,243	350,114
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	240	1,274	137
Commercial | Real estate | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	75
Commercial | Real estate | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	828	777	503
Commercial | Construction
Schedule of Financing Receivables [Line Items]
All Past Due	15	10	0
Current	32,770	27,294	40,308
Total	32,785	27,304	40,308
90 Days or More & Accruing	0	0	0
Commercial | Construction | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	15	0	0
Commercial | Construction | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	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	2,295	580	795
Current	203,615	195,811	183,923
Total	205,910	196,391	184,718
90 Days or More & Accruing	0	0	0
Commercial | Other | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	2,031	455	459
Commercial | Other | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	5	42
Commercial | Other | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	264	120	294
Municipal
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Current	36,113	51,128	48,717
Total	36,113	51,128	48,717
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	13,239	17,667	14,583
Total	13,239	17,743	14,583
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	7,279	6,638	4,275
Current	474,070	462,507	449,313
Total	481,349	469,145	453,588
90 Days or More & Accruing	664	339	0
Residential | Term | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,079	1,097	531
Residential | Term | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	2,302	3,518	2,014
Residential | Term | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	3,898	2,023	1,730
Home equity line of credit
Schedule of Financing Receivables [Line Items]
All Past Due	1,242	3,731	1,528
Current	93,521	94,738	106,138
Total	94,763	98,469	107,666
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	698	2,819	915
Home equity line of credit | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	197	419	38
Home equity line of credit | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	347	493	575
Consumer
Schedule of Financing Receivables [Line Items]
All Past Due	375	289	125
Current	25,017	24,571	24,621
Total	25,392	24,860	24,746
90 Days or More & Accruing	8	12	3
Consumer | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	336	237	70
Consumer | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	30	25	37
Consumer | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	$ 9	$ 27	$ 18

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