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Loans - Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loans:
Loans - Gross	$ 622,345us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 576,343us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Less: Net deferred loan fees and costs	(419)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	(230)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums
Loans after net deferred loan fees and costs	621,926fmb_LoansAfterNetDeferredLoanFeesAndCosts	576,113fmb_LoansAfterNetDeferredLoanFeesAndCosts
Less: Allowance for loan losses	(5,905)us-gaap_LoansAndLeasesReceivableAllowance	(5,194)us-gaap_LoansAndLeasesReceivableAllowance	(5,224)us-gaap_LoansAndLeasesReceivableAllowance	(5,091)us-gaap_LoansAndLeasesReceivableAllowance
Loans - Net	616,021us-gaap_LoansAndLeasesReceivableNetReportedAmount	570,919us-gaap_LoansAndLeasesReceivableNetReportedAmount
Commercial Real Estate [Member]
Loans:
Loans - Gross	270,188us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember	248,893us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Agricultural Real Estate [Member]
Loans:
Loans - Gross	50,895us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember	44,301us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember
Consumer Real Estate [Member]
Loans:
Loans - Gross	97,550us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember	92,438us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember
Commercial and Industrial [Member]
Loans:
Loans - Gross	100,126us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember	99,498us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember
Agricultural [Member]
Loans:
Loans - Gross	74,611us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember	65,449us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember
Consumer [Member]
Loans:
Loans - Gross	24,277us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember	21,406us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Industrial Development Bonds [Member]
Loans:
Loans - Gross	$ 4,698us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember	$ 4,358us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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