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Fair Value (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reconciliation for all assets measured at fair value on a recurring basis using significant unobservable inputs
Beginning Balance	$ 4	$ 5
Transfers from level 2	0	0
Repayments, calls and maturities	0	0
Ending Balance	$ 4	$ 5

X

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset period increase.

+ References

No definition available.

+ Details

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X

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset repayments calls and maturities.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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X

- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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