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Employee Benefit Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Employees	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum percentage of eligible compensation on a pre-tax basis for eligible employees to save	1.00%fmb_MinimumPercentageOfEligibleCompensationOnPreTaxBasisForEligibleEmployeesToSave
Employee contribution matching percentage	50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Percentage of total eligible compensation, contribution by Bank, maximum limit	4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Vesting percentage in participant's deferral contributions and employer matching contributions	100.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Vesting period	6 years
Employer matching contribution and the discretionary contribution	$ 779us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 670us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 744us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Restricted stock awards, shares issued	13,250us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross	11,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross	11,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Number of employees, received the stock	2fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
Two employees received shares from awards granted due to retirement	965fmb_NumberOfAwardsGrantedToTwoEmployeesOnRetirement
Expense for restricted stock awards	232us-gaap_RestrictedStockExpense	253us-gaap_RestrictedStockExpense	217us-gaap_RestrictedStockExpense
Awards grants originated in 2009, 2010 and 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees, received the stock	1fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees / us-gaap_AwardDateAxis = fmb_AwardGrantsOriginatedInPeriodOneMember
One employee received shares from awards granted due to retirement	210fmb_NumberOfAwardsGrantedToOneEmployeeOnRetirement / us-gaap_AwardDateAxis = fmb_AwardGrantsOriginatedInPeriodOneMember
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock issued to number of employees	61fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployeeShareIssued / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	53fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployeeShareIssued / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	54fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployeeShareIssued / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Shares vest under the plan	100.00%fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareVestedPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	100.00%fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareVestedPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	100.00%fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareVestedPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Shares forfeited due to employee termination	780us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	620us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	1,135us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Number of shares vested	10,970us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	9,160us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	8,910us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Number of employees, received the stock	48fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	45fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	41fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Compensation expense	252us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	253us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	219us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Unrecognized compensation cost related to the nonvested portion of restricted stock awards under the plan	$ 455us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Restricted Stock Awards [Member] | 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested			8,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardDateAxis = fmb_YearTwoThousandNineMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Restricted Stock Awards [Member] | 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested		9,160us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardDateAxis = fmb_YearTwoThousandTenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Restricted Stock Awards [Member] | 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested	10,005us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardDateAxis = fmb_YearTwoThousandElevenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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- Definition

Minimum Percentage Of Eligible Compensation On Pre Tax Basis For Eligible Employees To Save

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Number Of Awards Granted To One Employee On Retirement

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Number Of Awards Granted To Two Employees On Retirement

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Share Vested Percentage

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Share Based Compensation Arrangement By Share Based Payment Award Number Of Employees

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Share Based Compensation Arrangement By Share Based Payment Award Number Of Employee Share Issued

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

-Subparagraph (a)(1)

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Name Accounting Standards Codification

-Topic 718

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Paragraph 2

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