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Off Balance Sheet Activities - Outstanding Financial Instruments Whose Contract Amounts Represent Credit Risk (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Commitments to extend credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Concentration of Risk | $ 212,258 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember | $ 201,891 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Credit card arrangements [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Concentration of Risk | 15,064 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FinancialInstrumentAxis = fmb_CreditCardArrangementsMember | 14,818 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FinancialInstrumentAxis = fmb_CreditCardArrangementsMember
Standby letters of credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Concentration of Risk | $ 694 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember | $ 1,567 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember

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- Definition The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 + Details
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- Details
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- Details
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- Details
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- Details
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