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Loans (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Schedule of loan balances        
Subtotal $ 671,643us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 661,625us-gaap_LoansAndLeasesReceivableGrossCarryingAmount    
Net deferred loan costs 2,141us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums 2,227us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums    
Allowance for loan losses (7,723)us-gaap_LoansAndLeasesReceivableAllowance (7,632)us-gaap_LoansAndLeasesReceivableAllowance (7,387)us-gaap_LoansAndLeasesReceivableAllowance (7,568)us-gaap_LoansAndLeasesReceivableAllowance
NET LOANS 666,061us-gaap_LoansAndLeasesReceivableNetReportedAmount 656,220us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Commercial real estate, Owner occupied        
Schedule of loan balances        
Commercial real estate 77,720us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_CommercialRealEstateOwnerOccupiedMember
74,829us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_CommercialRealEstateOwnerOccupiedMember
   
Commercial real estate, Non-owner occupied        
Schedule of loan balances        
Commercial real estate 125,254us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_CommercialRealEstateNonOwnerOccupiedMember
122,228us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_CommercialRealEstateNonOwnerOccupiedMember
   
Commercial real estate, Other        
Schedule of loan balances        
Commercial real estate 29,016us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
26,137us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Commercial        
Schedule of loan balances        
Commercial 122,762us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
120,493us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Allowance for loan losses (1,351)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
(1,420)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
(1,065)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
(1,219)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Residential real estate, 1-4 family residential        
Schedule of loan balances        
Residential real estate 154,076us-gaap_LoansAndLeasesReceivableConsumerRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_ResidentialRealEstateOneToFourFamilyResidentialMember
153,055us-gaap_LoansAndLeasesReceivableConsumerRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_ResidentialRealEstateOneToFourFamilyResidentialMember
   
Residential real estate, Home equity lines of credit        
Schedule of loan balances        
Residential real estate 32,310us-gaap_LoansAndLeasesReceivableConsumerRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_ResidentialRealEstateHomeEquityMember
31,255us-gaap_LoansAndLeasesReceivableConsumerRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_ResidentialRealEstateHomeEquityMember
   
Consumer, Indirect        
Schedule of loan balances        
Consumer 118,065us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_ConsumerIndirectMember
120,931us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_ConsumerIndirectMember
   
Consumer, Direct        
Schedule of loan balances        
Consumer 8,888us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_ConsumerDirectMember
9,071us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmnb_ConsumerDirectMember
   
Consumer, Other        
Schedule of loan balances        
Consumer $ 3,552us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
$ 3,626us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember