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Loans (Details 1) - National Bancshares Corporation - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable Impaired [Line Items] |  |
Total outstanding balance | $ 2,099 | $ 2,129
Carrying amount, net of allowance | 1,722 | 1,733
Commercial real estate, Owner occupied | Commercial real estate |  |
Financing Receivable Impaired [Line Items] |  |
Loans acquired with deteriorated credit quality | 706 | 670
Commercial real estate, Non-owner occupied | Commercial real estate |  |
Financing Receivable Impaired [Line Items] |  |
Loans acquired with deteriorated credit quality | 378 | 387
Commercial, Commercial and industrial | Commercial |  |
Financing Receivable Impaired [Line Items] |  |
Loans acquired with deteriorated credit quality | $ 1,015 | $ 1,072

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