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Troubled Debt Restructurings (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Loan
Mar. 31, 2014
Loan
Financing Receivable Recorded Investment [Line Items]    
Number of Loans 7us-gaap_FinancingReceivableModificationsNumberOfContracts2 12us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre-Modification Outstanding Recorded Investment $ 448us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 $ 480us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post-Modification Outstanding Recorded Investment 448us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 481us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Commercial    
Financing Receivable Recorded Investment [Line Items]    
Number of Loans 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
 
Pre-Modification Outstanding Recorded Investment 8us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
 
Post-Modification Outstanding Recorded Investment 8us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
 
Residential real estate, 1-4 family residential    
Financing Receivable Recorded Investment [Line Items]    
Number of Loans 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateOneToFourFamilyResidentialMember
9us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateOneToFourFamilyResidentialMember
Pre-Modification Outstanding Recorded Investment 354us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateOneToFourFamilyResidentialMember
393us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateOneToFourFamilyResidentialMember
Post-Modification Outstanding Recorded Investment 354us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateOneToFourFamilyResidentialMember
394us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateOneToFourFamilyResidentialMember
Residential real estate, Home equity lines of credit    
Financing Receivable Recorded Investment [Line Items]    
Number of Loans 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateHomeEquityMember
2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateHomeEquityMember
Pre-Modification Outstanding Recorded Investment 50us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateHomeEquityMember
52us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateHomeEquityMember
Post-Modification Outstanding Recorded Investment 50us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateHomeEquityMember
52us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ResidentialRealEstateHomeEquityMember
Consumer, Indirect    
Financing Receivable Recorded Investment [Line Items]    
Number of Loans 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ConsumerIndirectMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ConsumerIndirectMember
Pre-Modification Outstanding Recorded Investment 36us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ConsumerIndirectMember
35us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ConsumerIndirectMember
Post-Modification Outstanding Recorded Investment $ 36us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ConsumerIndirectMember
$ 35us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fmnb_ConsumerIndirectMember