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Employee Benefit Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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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 | $ 779 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 670 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 744 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Restricted stock awards, shares issued | 13,250 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross | 11,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross | 11,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Number of employees, received the stock | 2 fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees |  |
Two employees received shares from awards granted due to retirement | 965 fmb_NumberOfAwardsGrantedToTwoEmployeesOnRetirement |  |
Expense for restricted stock awards | 232 us-gaap_RestrictedStockExpense | 253 us-gaap_RestrictedStockExpense | 217 us-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 | 1 fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees / us-gaap_AwardDateAxis = fmb_AwardGrantsOriginatedInPeriodOneMember |  |
One employee received shares from awards granted due to retirement | 210 fmb_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 | 61 fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployeeShareIssued / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 53 fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployeeShareIssued / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 54 fmb_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 | 780 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 620 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 1,135 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Number of shares vested | 10,970 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 9,160 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 8,910 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Number of employees, received the stock | 48 fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 45 fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 41 fmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Compensation expense | 252 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 253 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 219 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Unrecognized compensation cost related to the nonvested portion of restricted stock awards under the plan | $ 455 us-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 |  |  | 8,700 us-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 |  | 9,160 us-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 | 10,005 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardDateAxis = fmb_YearTwoThousandElevenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |

X
- Definition Minimum Percentage Of Eligible Compensation On Pre Tax Basis For Eligible Employees To Save + References No definition available. + Details
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- Definition Number Of Awards Granted To One Employee On Retirement + References No definition available. + Details
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- Definition Number Of Awards Granted To Two Employees On Retirement + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Share Vested Percentage + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Number Of Employees + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Number Of Employee Share Issued + References No definition available. + Details
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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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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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) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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