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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	Mar. 31, 2015
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	$ 77,681us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate	19,461us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	37,478us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate	13,989us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	66,318us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember
Distribution of variable rate loans by major loan category, Variable Rate	5,156us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	187,012us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate	84,664us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	77,104us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember
Distribution of variable rate loans by major loan category, Variable Rate	18,024us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	19,528us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Distribution of variable rate loans by major loan category, Variable Rate	4,077us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Industrial Development Bonds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	4,505us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_IndustrialDevelopmentBondsMember
Distribution of variable rate loans by major loan category, Variable Rate	$ 168us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_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

-Paragraph 2

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

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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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