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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
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan Losses
Balance at beginning of year				$ 5,194us-gaap_LoansAndLeasesReceivableAllowance				$ 5,224us-gaap_LoansAndLeasesReceivableAllowance	$ 5,194us-gaap_LoansAndLeasesReceivableAllowance	$ 5,224us-gaap_LoansAndLeasesReceivableAllowance	$ 5,091us-gaap_LoansAndLeasesReceivableAllowance
Provision for loan loss	37us-gaap_ProvisionForLoanAndLeaseLosses	282us-gaap_ProvisionForLoanAndLeaseLosses	444us-gaap_ProvisionForLoanAndLeaseLosses	428us-gaap_ProvisionForLoanAndLeaseLosses	276us-gaap_ProvisionForLoanAndLeaseLosses	303us-gaap_ProvisionForLoanAndLeaseLosses	112us-gaap_ProvisionForLoanAndLeaseLosses	167us-gaap_ProvisionForLoanAndLeaseLosses	1,191us-gaap_ProvisionForLoanAndLeaseLosses	858us-gaap_ProvisionForLoanAndLeaseLosses	738us-gaap_ProvisionForLoanAndLeaseLosses
Loans charged off									(778)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs	(1,262)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs	(891)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Recoveries									298us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	374us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	286us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Balance at ending of year	5,905us-gaap_LoansAndLeasesReceivableAllowance				5,194us-gaap_LoansAndLeasesReceivableAllowance				5,905us-gaap_LoansAndLeasesReceivableAllowance	5,194us-gaap_LoansAndLeasesReceivableAllowance	5,224us-gaap_LoansAndLeasesReceivableAllowance
Allowance for Unfunded Loan Commitments & Letters of Credit	207fmb_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit				163fmb_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit				207fmb_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	163fmb_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	162fmb_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit
Total Allowance for Credit Losses	$ 6,112us-gaap_FinancingReceivableAllowanceForCreditLosses				$ 5,357us-gaap_FinancingReceivableAllowanceForCreditLosses				$ 6,112us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 5,357us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 5,386us-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.

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- 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

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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

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

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- 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

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

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