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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

X

- Definition

Change in fair value of assets and liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmao_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

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

X

- Details

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