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Business Combination and Asset Purchase - Summary of Carrying Amount of Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Business Combinations [Abstract]
Carrying amount, allowance	$ 96	$ 2,118

X

- Definition

Certain loans acquired in transfer accounted for as debt securities carrying amount allowance.

+ References

No definition available.

+ Details

Name:	fmao_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountAllowance
Namespace Prefix:	fmao_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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