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Loans - Maturity Schedule by Major Category of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	$ 10,983fmao_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember
Maturity schedule by major category of loans, After One Year Within Five Years	19,428fmao_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember
Maturity schedule by major category of loans, After Five Years	66,731fmao_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	3,713fmao_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Maturity schedule by major category of loans, After One Year Within Five Years	13,800fmao_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Maturity schedule by major category of loans, After Five Years	33,954fmao_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	40,522fmao_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember
Maturity schedule by major category of loans, After One Year Within Five Years	26,855fmao_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember
Maturity schedule by major category of loans, After Five Years	4,097fmao_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	30,529fmao_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Maturity schedule by major category of loans, After One Year Within Five Years	84,230fmao_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Maturity schedule by major category of loans, After Five Years	156,917fmao_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	55,841fmao_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember
Maturity schedule by major category of loans, After One Year Within Five Years	34,222fmao_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember
Maturity schedule by major category of loans, After Five Years	5,065fmao_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	4,813fmao_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Maturity schedule by major category of loans, After One Year Within Five Years	14,487fmao_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Maturity schedule by major category of loans, After Five Years	4,305fmao_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Industrial Development Bonds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	2,498fmao_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = fmao_IndustrialDevelopmentBondsMember
Maturity schedule by major category of loans, After One Year Within Five Years	127fmao_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = fmao_IndustrialDevelopmentBondsMember
Maturity schedule by major category of loans, After Five Years	$ 2,048fmao_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = fmao_IndustrialDevelopmentBondsMember

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