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Loans and allowance for loan losses (Details 1) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | $ 735,865 | $ 677,006 | $ 620,591
Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 720,373 | 660,090 |
Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 7,154 | 7,805 |
Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 4,508 | 6,163 |
Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 3,830 | 2,948 |
Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 239,163 | 223,030 | 220,697
Commercial real estate | Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 13,357 | 12,870 |
Commercial real estate | Construction | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 13,357 | 12,870 |
Commercial real estate | Construction | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Commercial real estate | Construction | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Commercial real estate | Construction | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Commercial real estate | Non-residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 207,027 | 197,499 |
Commercial real estate | Non-residential | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 197,330 | 186,020 |
Commercial real estate | Non-residential | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 6,495 | 6,840 |
Commercial real estate | Non-residential | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 3,202 | 4,639 |
Commercial real estate | Non-residential | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Commercial real estate | Multifamily |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 18,779 | 12,661 |
Commercial real estate | Multifamily | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 18,394 | 12,261 |
Commercial real estate | Multifamily | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Commercial real estate | Multifamily | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 385 | 400 |
Commercial real estate | Multifamily | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Residential real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 39,959 | 43,534 | 43,736
Residential real estate | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 37,263 | 41,249 |
Residential real estate | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Residential real estate | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Residential real estate | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 2,696 | 2,285 |
Commercial and industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 89,473 | 83,203 | 75,612
Commercial and industrial | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 87,853 | 81,111 |
Commercial and industrial | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 659 | 965 |
Commercial and industrial | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 921 | 1,124 |
Commercial and industrial | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 40 | 3 |
Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 28,903 | 30,095 | 30,329
Consumer | Indirect automobile |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 338,367 | 297,144 | $ 250,217
Consumer | Indirect automobile | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 337,777 | 296,692 |
Consumer | Indirect automobile | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Consumer | Indirect automobile | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Consumer | Indirect automobile | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 590 | 452 |
Consumer | Home equity |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 18,591 | 19,269 |
Consumer | Home equity | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 18,127 | 19,071 |
Consumer | Home equity | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Consumer | Home equity | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Consumer | Home equity | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 464 | 198 |
Consumer | Other consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 10,312 | 10,826 |
Consumer | Other consumer | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 10,272 | 10,816 |
Consumer | Other consumer | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Consumer | Other consumer | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 0 | 0 |
Consumer | Other consumer | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | $ 40 | $ 10 |

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