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Loans - Risk Category of Loans by Portfolio Class (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | $ 622,345 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 576,343 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 50,895 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember | 44,301 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember
Agricultural Real Estate [Member] | 1-2 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 4,319 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_ExcellentAndGoodMember | 3,764 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_ExcellentAndGoodMember
Agricultural Real Estate [Member] | 3 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 15,780 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMember | 14,588 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMember
Agricultural Real Estate [Member] | 4 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 30,472 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMonitoredMember | 25,186 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMonitoredMember
Agricultural Real Estate [Member] | 5 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 111 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 729 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Agricultural Real Estate [Member] | 6 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 213 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 34 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 74,611 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember | 65,449 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember
Agricultural [Member] | 1-2 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 11,490 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember / us-gaap_InternalCreditAssessmentAxis = fmb_ExcellentAndGoodMember | 9,263 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember / us-gaap_InternalCreditAssessmentAxis = fmb_ExcellentAndGoodMember
Agricultural [Member] | 3 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 26,871 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMember | 27,212 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMember
Agricultural [Member] | 4 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 36,225 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMonitoredMember | 28,974 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMonitoredMember
Agricultural [Member] | 7 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 25 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember |
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 270,188 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 248,893 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Commercial Real Estate [Member] | 1-2 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 1,072 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_ExcellentAndGoodMember | 1,104 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_ExcellentAndGoodMember
Commercial Real Estate [Member] | 3 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 34,229 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMember | 55,060 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMember
Commercial Real Estate [Member] | 4 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 225,015 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMonitoredMember | 182,277 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMonitoredMember
Commercial Real Estate [Member] | 5 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 7,083 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 4,987 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Commercial Real Estate [Member] | 6 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 2,080 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 5,092 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial Real Estate [Member] | 7 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 709 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 373 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 100,126 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 99,498 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember
Commercial and Industrial [Member] | 1-2 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 1,771 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = fmb_ExcellentAndGoodMember | 2,525 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = fmb_ExcellentAndGoodMember
Commercial and Industrial [Member] | 3 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 15,582 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMember | 21,610 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMember
Commercial and Industrial [Member] | 4 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 80,079 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMonitoredMember | 72,059 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMonitoredMember
Commercial and Industrial [Member] | 5 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 2,299 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 2,119 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Commercial and Industrial [Member] | 6 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 165 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 758 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial and Industrial [Member] | 7 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 230 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 427 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
Industrial Development Bonds [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 4,698 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember | 4,358 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember
Industrial Development Bonds [Member] | 3 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 4,289 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMember | 3,869 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMember
Industrial Development Bonds [Member] | 4 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | $ 409 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMonitoredMember | $ 489 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember / us-gaap_InternalCreditAssessmentAxis = fmb_SatisfactoryMonitoredMember

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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