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Loans - Recorded Investment in Those Classes Based on Payment Activity and Assigned Risk Grading (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Consumer - Credit Card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	$ 3,987us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerCreditCardFinancingReceivableMember	$ 3,721us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerCreditCardFinancingReceivableMember
Consumer - Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	19,871us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember	17,455us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember
Performing [Member] | Consumer - Credit Card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	3,987us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerCreditCardFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember	3,721us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerCreditCardFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Performing [Member] | Consumer - Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	19,846us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember	17,425us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Nonperforming [Member] | Consumer - Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	25us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember	30us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	97,550us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember	92,438us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember
Consumer Real Estate [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	97,007us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember	92,226us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Consumer Real Estate [Member] | 6 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	446us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember	18us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Consumer Real Estate [Member] | 7 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	$ 97us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember	$ 194us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember

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- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

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