XML 122 R107.htm IDEA: XBRL DOCUMENT v3.22.0.1

Commitments and Contingent Liabilities (Details) - Commitments and Unused Lines of Credit - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fixed Rate
The contractual amounts of financial instruments with off-balance-sheet risk at year end
Total contractual amounts of financial instruments with off-balance-sheet risk	$ 119,003	$ 80,567
Variable Rate
The contractual amounts of financial instruments with off-balance-sheet risk at year end
Total contractual amounts of financial instruments with off-balance-sheet risk	$ 482,025	$ 344,970

X

- Definition

Fair value off balance sheet risks disclosure information.

+ References

No definition available.

+ Details

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

X

- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=fmnb_CommitmentsAndUnusedLinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=fmnb_FixedRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=fmnb_VariableRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: