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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
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Consumer - Credit Card [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Net | $ 3,987 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerCreditCardFinancingReceivableMember | $ 3,721 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerCreditCardFinancingReceivableMember
Consumer - Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Net | 19,871 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember | 17,455 us-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 | 3,987 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerCreditCardFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | 3,721 us-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 | 19,846 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | 17,425 us-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 | 25 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember | 30 us-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 | 97,550 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 92,438 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember
Consumer Real Estate [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Net | 97,007 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 92,226 us-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 | 446 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 18 us-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 | $ 97 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | $ 194 us-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 + Details
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