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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	$ 190,948us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate	79,240us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	36,168us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate	14,727us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	77,534us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate	20,016us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	76,625us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember
Distribution of variable rate loans by major loan category, Variable Rate	23,501us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	69,707us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember
Distribution of variable rate loans by major loan category, Variable Rate	4,904us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember
Consumer Master Card and Overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	19,566us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_ConsumerMasterCardAndOverdraftsMember
Distribution of variable rate loans by major loan category, Variable Rate	4,711us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_ConsumerMasterCardAndOverdraftsMember
Industrial Development Bonds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	4,529us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember
Distribution of variable rate loans by major loan category, Variable Rate	$ 169us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember

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- Definition

Amount of loan with fixed rate of interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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