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Note 6 - Credit Quality Information - Schedule of Loans Held for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loans, held for sale	$ 29,077	$ 30,171
Loans, held for sale, allowance	1,573	561
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Loans, held for sale	278	333
Loans, held for sale, allowance	10	11
Commercial Real Estate Portfolio Segment [Member] | Nonowner Occupied [Member]
Loans, held for sale	26,944	26,890
Loans, held for sale, allowance	1,504	420
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]
Loans, held for sale	0	3
Loans, held for sale, allowance	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans, held for sale	854	1,561
Loans, held for sale, allowance	48	115
Commercial Portfolio Segment [Member] | Agricultural [Member]
Loans, held for sale	88	117
Loans, held for sale, allowance	6	8
Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Loans, held for sale	909	1,264
Loans, held for sale, allowance	5	7
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Loans, held for sale	4	3
Loans, held for sale, allowance	$ 0	$ 0

X

- Definition

Represents the amount of allowance for credit loss for loans receivable held for sale.

+ References

No definition available.

+ Details

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

X

- Definition

Amount, before valuation allowance, of financing receivable classified as held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477011/948-310-45-1

+ Details

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