XML 93 R78.htm IDEA: XBRL DOCUMENT v3.8.0.1

Fair Value (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reconciliation for all assets measured at fair value on a recurring basis using significant unobservable inputs
Beginning Balance	$ 8	$ 12
Transfers from level 2	0	0
Repayments, calls and maturities	(1)	(1)
Ending Balance	$ 7	$ 11

X

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset period increase.

+ References

No definition available.

+ Details

Name:	fmnb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncrease
Namespace Prefix:	fmnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset repayments calls and maturities.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant