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Loans - Recorded Investment in Nonaccrual Loans by Portfolio Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Investment in nonaccrual loans | $ 2,424 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | $ 1,705 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | $ 2,615 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Investment in nonaccrual loans | 703 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 628 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Investment in nonaccrual loans | 222 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |  |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Investment in nonaccrual loans | 78 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |  |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Investment in nonaccrual loans | 978 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 709 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Investment in nonaccrual loans | 423 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 339 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Investment in nonaccrual loans | $ 20 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | $ 29 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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