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Fair Value of Instruments - Quantitative Information about Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
U.S. Government Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 7,837 us-gaap_AssetsFairValueDisclosure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | $ 7,931 us-gaap_AssetsFairValueDisclosure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Valuation Technique | Discounted cash flow | Discounted cash flow
Unobservable Inputs | Credit strength of underlying project or entity / Discount rate | Credit strength of underlying project or entity / Discount rate
Impaired Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 1,815 us-gaap_AssetsFairValueDisclosure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_ImpairedLoansMember | 1,456 us-gaap_AssetsFairValueDisclosure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_ImpairedLoansMember
Valuation Technique | Collateral based measurements | Collateral based measurements
Unobservable Inputs | Discount to reflect current market conditions and ultimate collectability | Discount to reflect current market conditions and ultimate collectability
Other Real Estate Owned - Residential [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value |  | 21 us-gaap_AssetsFairValueDisclosure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_OtherRealEstateResidentialMember
Valuation Technique |  | Appraisals
Unobservable Inputs |  | Discount to reflect current market
Other Real Estate Owned - Commercial [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value |  | $ 23 us-gaap_AssetsFairValueDisclosure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_OtherRealEstateCommercialMember
Valuation Technique |  | Appraisals
Unobservable Inputs |  | Discount to reflect current market
Minimum [Member] | U.S. Government Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted Average | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Impaired Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted Average | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Other Real Estate Owned - Residential [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted Average |  | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_OtherRealEstateResidentialMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Other Real Estate Owned - Commercial [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted Average |  | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_OtherRealEstateCommercialMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] | U.S. Government Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted Average | 5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Impaired Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted Average | 50.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 50.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Other Real Estate Owned - Residential [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted Average |  | 20.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_OtherRealEstateResidentialMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Other Real Estate Owned - Commercial [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted Average |  | 20.00%us-gaap_FairValueInputsDiscountRate / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmao_OtherRealEstateCommercialMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Description of significant assumptions used by management to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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