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Fair Value of Financial Instruments - Impaired Loans and Other Real Estate (Detail) (Fair Value on Nonrecurring Basis [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of assets	$ (208)us-gaap_AssetsFairValueAdjustment	$ (589)us-gaap_AssetsFairValueAdjustment
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total	1,456us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	1,924us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Change in fair value of assets	(168)us-gaap_AssetsFairValueAdjustment / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	(525)us-gaap_AssetsFairValueAdjustment / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total	21us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	964us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Change in fair value of assets	(8)us-gaap_AssetsFairValueAdjustment / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Other real estate owned - commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total	23us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_OtherRealEstateCommercialMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	1,127us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_OtherRealEstateCommercialMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Change in fair value of assets	(32)us-gaap_AssetsFairValueAdjustment / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_OtherRealEstateCommercialMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	(64)us-gaap_AssetsFairValueAdjustment / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_OtherRealEstateCommercialMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Level 1 [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total
Level 1 [Member] | Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total
Level 1 [Member] | Other real estate owned - commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total
Level 2 [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total
Level 2 [Member] | Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total
Level 2 [Member] | Other real estate owned - commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total
Level 3 [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total	1,456us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	1,924us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Level 3 [Member] | Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total	21us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	964us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Level 3 [Member] | Other real estate owned - commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis, Total	$ 23us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_OtherRealEstateCommercialMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	$ 1,127us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_OtherRealEstateCommercialMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember

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