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Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Impaired loans and other real estate |  |
Change in fair value of assets and liabilities | $ (352) | $ (928)
Fair Value, Measurements, Nonrecurring [Member] | Impaired loans [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | 4,591 | 1,854
Change in fair value of assets and liabilities | (76) | (150)
Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned - residential mortgages [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | 783 | 958
Change in fair value of assets and liabilities | (62) | (145)
Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned - commercial [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | 1,526 | 2,614
Change in fair value of assets and liabilities | (214) | (633)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired loans [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned - residential mortgages [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned - commercial [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Significant Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Significant Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired loans [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Significant Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned - residential mortgages [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Significant Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned - commercial [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired loans [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | 4,591 | 1,854
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned - residential mortgages [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | 783 | 958
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned - commercial [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | $ 1,526 | $ 2,614

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- Definition Change in fair value of assets and liabilities. + References No definition available. + Details
Name: | fmao_ChangeInFairValueOfAssetsAndLiabilities
Namespace Prefix: | fmao_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration