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Off Balance Sheet Activities (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Off Balance Sheet Activities (Textual) [Abstract] |  |
Allowance for credit losses relates to unfunded loan commitments | $ 163 | $ 130

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- Definition Allowance for credit losses relates to unfunded loan commitments. + References No definition available. + Details
Name: | fmao_AllowanceForCreditLossesRelatesToUnfundedLoanCommitments
Namespace Prefix: | fmao_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | fmao_OffBalanceSheetActivitiesTextualAbstract
Namespace Prefix: | fmao_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration