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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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- Definition

Certain loans acquired in transfer accounted for as debt securities acquired during period contractually required payments receivable at acquisition net carrying value.

+ References

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- Definition

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- Definition

Amount of contractually required payments receivable at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

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