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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 Contract | Mar. 31, 2014 Contract
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified in the Last 3 Months | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Pre-Modification Outstanding Recorded Investment | $ 528 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Post-Modification Outstanding Recorded Investment | 430 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Agricultural Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified in the Last 3 Months |  | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Pre-Modification Outstanding Recorded Investment |  | 153 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Post-Modification Outstanding Recorded Investment |  | 141 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified in the Last 3 Months | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |
Pre-Modification Outstanding Recorded Investment | 28 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |
Post-Modification Outstanding Recorded Investment | $ 24 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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