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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification 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] |  |  |
30-59 Days Past Due | $ 451 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue | $ 841 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue |
60-89 Days Past Due | 583 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue | 270 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue |
Greater Than 90 Days | 1,585 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue | 1,174 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue |
Total Past Due | 2,619 us-gaap_FinancingReceivableRecordedInvestmentPastDue | 2,285 us-gaap_FinancingReceivableRecordedInvestmentPastDue |
Current | 612,090 us-gaap_FinancingReceivableRecordedInvestmentCurrent | 619,641 us-gaap_FinancingReceivableRecordedInvestmentCurrent |
Total Financing Receivables | 614,709 fmao_FinancingReceivablesCurrentAndPastDue | 621,926 fmao_FinancingReceivablesCurrentAndPastDue | 582,872 fmao_FinancingReceivablesCurrentAndPastDue
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 368 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 713 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |
60-89 Days Past Due | 580 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 50 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |
Greater Than 90 Days | 227 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 436 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |
Total Past Due | 1,175 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 1,199 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |
Current | 95,844 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 96,351 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |
Total Financing Receivables | 97,019 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 97,550 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 91,368 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Greater Than 90 Days | 222 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |  |
Total Past Due | 222 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |  |
Current | 51,174 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember | 50,895 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |
Total Financing Receivables | 51,396 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember | 50,895 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember | 49,629 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due |  | 25 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |
Greater Than 90 Days | 54 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |  |
Total Past Due | 54 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 25 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |
Current | 71,517 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 74,586 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |
Total Financing Receivables | 71,571 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 74,611 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 64,859 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 14 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 78 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
60-89 Days Past Due |  | 204 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Greater Than 90 Days | 978 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 709 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Total Past Due | 992 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 991 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Current | 270,209 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 269,197 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Total Financing Receivables | 271,201 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 270,188 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 261,634 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 35 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |  |
60-89 Days Past Due |  | 8 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |
Greater Than 90 Days | 84 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |  |
Total Past Due | 119 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 8 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |
Current | 99,776 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 104,816 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |
Total Financing Receivables | 99,895 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 104,824 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 94,358 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 34 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 25 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
60-89 Days Past Due | 3 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 8 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Greater Than 90 Days | 20 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 29 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Total Past Due | 57 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 62 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Current | 23,570 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 23,796 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Total Financing Receivables | 23,627 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 23,858 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 21,024 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Recorded Investment > 90 Days and Accruing | $ 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | $ 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |

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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + 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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