XML 76 R65.htm IDEA: XBRL DOCUMENT
v3.21.2

Fair Value (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reconciliation for all assets measured at fair value on a recurring basis using significant unobservable inputs |  |  |  |
Beginning Balance | $ 3 | $ 4 | $ 4 | $ 5
Transfers from level 2 | 0 | 0 | 0 | 0
Repayments, calls and maturities | 0 | 0 | (1) | (1)
Ending Balance | $ 3 | $ 4 | $ 3 | $ 4

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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant