XML 57 R47.htm IDEA: XBRL DOCUMENT v3.23.1

Loans - Schedule of Collateral-dependent Loans (Detail) $ in Thousands	Mar. 31, 2023 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	$ 9
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	$ 9

X

- Definition

Financial collateral dependent loans.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: