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Loans - Summary of Activities in Allowance for Credit Losses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Allowance for Loan & Lease Losses
Balance at beginning of year	$ 5,905us-gaap_LoansAndLeasesReceivableAllowance	$ 5,194us-gaap_LoansAndLeasesReceivableAllowance	$ 5,194us-gaap_LoansAndLeasesReceivableAllowance
Provision for loan loss	114us-gaap_ProvisionForLoanAndLeaseLosses	428us-gaap_ProvisionForLoanAndLeaseLosses	1,191us-gaap_ProvisionForLoanAndLeaseLosses
Loans charged off	(92)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs	(366)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs	(778)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Recoveries	50us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	69us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	298us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Balance at ending of year	5,977us-gaap_LoansAndLeasesReceivableAllowance		5,905us-gaap_LoansAndLeasesReceivableAllowance
Allowance for Unfunded Loan Commitments & Letters of Credit	202fmao_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit		207fmao_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit
Total Allowance for Credit Losses	$ 6,179us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 5,505us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 6,112us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 5,357us-gaap_FinancingReceivableAllowanceForCreditLosses

X

- Definition

Allowance is intended to reflect the potential for losses that may not be funded but for which the bank has made a commitment to fund including letters of credit.

+ References

No definition available.

+ Details

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X

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(4)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

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-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

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-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524



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-Publisher FASB

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-Subparagraph (c)(1)

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

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-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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