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Servicing - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Transfers and Servicing [Abstract]
Loans serviced for others unpaid principal amount	$ 375,600	$ 380,800
Capitalized service right assets included in other assets	3,500	3,600
Fair market value of the capitalized servicing rights	$ 5,100	$ 3,200
Prepayment rate	7.70%	21.70%
Discount yield	5.94%	1.97%
Valuation allowance		$ 414

X

- Definition

Capitalized service right assets fair market value.

+ References

No definition available.

+ Details

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X

- Definition

Capitalized service right assets included in other assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmao_
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X

- Definition

Loans serviced for others unpaid principal amount.

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase (decrease) in the amortized amount from a decrease (increase) in the valuation allowance applied to the servicing asset for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (a)(5)
-URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122739-111746

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X

- Definition

Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122596-111746

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- Definition

Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122596-111746

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- References

No definition available.

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