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Loan Servicing - Summary of Principal Balance for Mortgage Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
FHLMC
Mortgage loan portfolio serviced for:
Loan Portfolio Expense	$ 179,253	$ 121,274

X

- Definition

Mortgage loan portfolios serviced for.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmnb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107314-111719

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: