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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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