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Loans (Details 10) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Loans And Leases Receivable Disclosure [Abstract]
Par value of acquired loans at acquisition	$ 483,666
Net purchase discount	(4,207)
Allowance for credit losses of PCD loans	(1,295)
Fair value of loans at acquisition	$ 478,164

X

- Definition

Allowance for credit losses of PCD loans.

+ References

No definition available.

+ Details

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

X

- Definition

Net purchase discount.

+ References

No definition available.

+ Details

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

X

- 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

- References

No definition available.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireLoansReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration