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

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