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Loans (Details 1) - National Bancshares Corporation - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable Impaired [Line Items] |  |
Total outstanding balance | $ 2,129 | $ 2,338
Carrying amount, net of allowance | 1,733 | 2,181
Commercial real estate, Owner occupied | Commercial real estate |  |
Financing Receivable Impaired [Line Items] |  |
Loans acquired with deteriorated credit quality | 670 | 689
Commercial real estate, Non-owner occupied | Commercial real estate |  |
Financing Receivable Impaired [Line Items] |  |
Loans acquired with deteriorated credit quality | 387 | 436
Commercial, Commercial and industrial | Commercial |  |
Financing Receivable Impaired [Line Items] |  |
Loans acquired with deteriorated credit quality | $ 1,072 | $ 1,213

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