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Loans (Details 1) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Receivables Acquired with Deteriorated Credit Quality | National Bancshares Corporation
Financing Receivable Impaired [Line Items]
Acquired with deteriorated credit quality, allowances	$ 0	$ 0

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=fmnb_NationalBancsharesCorporationMember
Namespace Prefix:
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Balance Type:
Period Type: