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Loans (Details Textual)	3 Months Ended
	Mar. 31, 2022 USD ($)
Receivables [Abstract]
Deferred loan payments	$ 0

X

- Definition

Deferred loan payments.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration