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Credit Quality Indicators (Details 4) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Risks and Uncertainties [Abstract]
Par value of acquired loans at acquisition	$ 797,616
Net purchase discount	(55,958)
Allowance for credit losses of PCD loans	(999)
Purchase price of loans at acqisition	$ 740,659

X

- Definition

Allowance for credit losses of PCD loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmnb_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Net purchase discount.

+ References

No definition available.

+ Details

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

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- Definition

Par value of acquired loans at acquisition.

+ References

No definition available.

+ Details

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

X

- Definition

The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-13

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

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- References

No definition available.

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