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FAIR VALUE OF INSTRUMENTS - Impaired Loans and Other Real Estate (Detail) (Fair Value on Nonrecurring Basis [Member], USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Change in fair value of assets and liabilities | $ (80) | $ (352)
Impaired loans [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total | 1,562 | 4,591
Change in fair value of assets and liabilities |  | (76)
Other real estate owned residential mortgages [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total | 886 | 783
Change in fair value of assets and liabilities | (16) | (62)
Other real estate owned commercial [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total | 1,475 | 1,526
Change in fair value of assets and liabilities | (64) | (214)
Level 1 [Member] | Impaired loans [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Level 1 [Member] | Other real estate owned residential mortgages [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Level 1 [Member] | Other real estate owned commercial [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Level 2 [Member] | Impaired loans [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Level 2 [Member] | Other real estate owned residential mortgages [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Level 2 [Member] | Other real estate owned commercial [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total |  |
Level 3 [Member] | Impaired loans [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total | 1,562 | 4,591
Level 3 [Member] | Other real estate owned residential mortgages [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total | 886 | 783
Level 3 [Member] | Other real estate owned commercial [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Assets measured at fair value on a nonrecurring basis, total | $ 1,475 | $ 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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- Details
Name: | fmao_FairValueOfAssetsAndLiabilitiesMeasuredOnNonRecurringBasisLineItems
Namespace Prefix: | fmao_
Data Type: | xbrli:stringItemType
Balance Type: | na
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