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Deposits (Details Textual) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Interest Bearing Deposits (Textual) [Abstract]
Minimum time deposits amount	$ 250,000
Time deposits of $100 thousand or more	$ 290,300,000	$ 258,200,000

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- Definition

Interest Bearing Deposits (Textual) [Abstract]

+ References

No definition available.

+ Details

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

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- Definition

Minimum time deposits.

+ References

No definition available.

+ Details

Name:	fmnb_MinimumTimeDeposits
Namespace Prefix:	fmnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more.

+ References

No definition available.

+ Details

Name:	us-gaap_TimeDeposits100000OrMore
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant