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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
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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 | 1,456 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 1,924 us-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 | 21 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 964 us-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 | 23 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_OtherRealEstateCommercialMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 1,127 us-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 | 1,456 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 1,924 us-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 | 21 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 964 us-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 | $ 23 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_OtherRealEstateCommercialMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | $ 1,127 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fmb_OtherRealEstateCommercialMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember

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- Definition Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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