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Fair Value of Instruments (Details 2) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Impaired loans and other real estate |  |
Change in fair value of assets and liabilities | $ (20) | $ (352)
Impaired loans [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | 4,144 | 4,591
Change in fair value of assets and liabilities | (20) | (76)
Other real estate owned - residential mortgages [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | 817 | 783
Change in fair value of assets and liabilities |  | (62)
Other real estate owned - commercial [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | 1,409 | 1,526
Change in fair value of assets and liabilities |  | (214)
Quoted Prices in Active Markets for Identical Assets (Level 1) [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] | 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] | 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] | 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] | 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] | 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] | Impaired loans [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | 4,144 | 4,591
Significant Unobservable Inputs (Level 3) [Member] | Other real estate owned - residential mortgages [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | 817 | 783
Significant Unobservable Inputs (Level 3) [Member] | Other real estate owned - commercial [Member] |  |
Impaired loans and other real estate |  |
Assets measured at fair value on a nonrecurring basis, total | $ 1,409 | $ 1,526

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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