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Loans - Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loans:
Loans - Gross	$ 615,165us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 622,345us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Less: Net deferred loan fees and costs	(456)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	(419)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums
Loans after net deferred loan fees and costs	614,709fmao_LoansAfterNetDeferredLoanFeesAndCosts	621,926fmao_LoansAfterNetDeferredLoanFeesAndCosts
Less: Allowance for loan losses	(5,977)us-gaap_LoansAndLeasesReceivableAllowance	(5,905)us-gaap_LoansAndLeasesReceivableAllowance	(5,194)us-gaap_LoansAndLeasesReceivableAllowance
Loans - Net	608,732us-gaap_LoansReceivableNet	616,021us-gaap_LoansReceivableNet
Commercial Real Estate [Member]
Loans:
Loans - Gross	271,676us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember	270,188us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Agricultural Real Estate [Member]
Loans:
Loans - Gross	51,467us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember	50,895us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Consumer Real Estate [Member]
Loans:
Loans - Gross	97,142us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember	97,550us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember
Commercial and Industrial [Member]
Loans:
Loans - Gross	95,128us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember	100,126us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember
Agricultural [Member]
Loans:
Loans - Gross	71,474us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember	74,611us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember
Consumer [Member]
Loans:
Loans - Gross	23,605us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember	24,277us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Industrial Development Bonds [Member]
Loans:
Loans - Gross	$ 4,673us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmao_IndustrialDevelopmentBondsMember	$ 4,698us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmao_IndustrialDevelopmentBondsMember

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Loans after net deferred loan fees and costs.

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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

-Topic 942

-SubTopic 210

-Section S99

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-Number Topic 6

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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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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

+ References

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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