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Loans and allowance for loan losses (Details 2) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 723,755	$ 664,580
Total	735,865	677,006	$ 620,591
Nonaccrual	6,150	5,672
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,069	7,030
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,896	1,813
Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,145	3,583
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	239,163	223,030	220,697
Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	13,357	12,870
Total	13,357	12,870
Nonaccrual	0	0
Commercial real estate | Construction | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial real estate | Construction | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial real estate | Construction | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial real estate | Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	204,559	193,273
Total	207,027	197,499
Nonaccrual	2,054	2,507
Commercial real estate | Non-residential | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	241	1,466
Commercial real estate | Non-residential | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	173	253
Commercial real estate | Non-residential | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,054	2,507
Commercial real estate | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	18,420	12,487
Total	18,779	12,661
Nonaccrual	0	0
Commercial real estate | Multifamily | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	174
Commercial real estate | Multifamily | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	359	0
Commercial real estate | Multifamily | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	37,993	42,083
Total	39,959	43,534	43,736
Nonaccrual	2,696	2,208
Residential real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	889	305
Residential real estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	615
Residential real estate | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,077	531
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	88,942	82,992
Total	89,473	83,203	75,612
Nonaccrual	306	297
Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	68	206
Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	423	1
Commercial and industrial | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	40	4
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	28,903	30,095	30,329
Consumer | Indirect automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	332,384	291,369
Total	338,367	297,144	$ 250,217
Nonaccrual	590	452
Consumer | Indirect automobile | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,520	4,429
Consumer | Indirect automobile | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	896	915
Consumer | Indirect automobile | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	567	431
Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	18,039	18,905
Total	18,591	19,269
Nonaccrual	463	198
Consumer | Home equity | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	186	264
Consumer | Home equity | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Consumer | Home equity | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	366	100
Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	10,061	10,601
Total	10,312	10,826
Nonaccrual	41	10
Consumer | Other consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	165	186
Consumer | Other consumer | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	45	29
Consumer | Other consumer | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 41	$ 10

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