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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

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset period increase. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset repayments calls and maturities. + References No definition available. + Details
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Namespace Prefix: | fmnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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- 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
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Balance Type: | debit
Period Type: | instant