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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

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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