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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
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Consumer Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Distribution of fixed rate loans by major loan category, Fixed Rate | $ 77,681 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate | 19,461 us-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 | 37,478 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate | 13,989 us-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 | 66,318 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember
Distribution of variable rate loans by major loan category, Variable Rate | 5,156 us-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 | 187,012 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate | 84,664 us-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 | 77,104 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember
Distribution of variable rate loans by major loan category, Variable Rate | 18,024 us-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 | 19,528 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Distribution of variable rate loans by major loan category, Variable Rate | 4,077 us-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 | 4,505 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmao_IndustrialDevelopmentBondsMember
Distribution of variable rate loans by major loan category, Variable Rate | $ 168 us-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 + Details
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- Definition Amount of loan with variable or adjustable 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 + Details
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