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Loans - Maturity Schedule by Major Category of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	$ 156,678fmb_MaturityScheduleByMajorCategoryOfLoansWithinOneYear
Maturity schedule by major category of loans, After One Year Within Five Years	199,118fmb_MaturityScheduleByMajorCategoryOfLoansAfterOneYear
Maturity schedule by major category of loans, After Five Years	266,549fmb_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears
Maturity schedule by major category of loans, Total	622,345us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	576,343us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	27,291fmb_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Maturity schedule by major category of loans, After One Year Within Five Years	92,076fmb_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Maturity schedule by major category of loans, After Five Years	150,821fmb_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Maturity schedule by major category of loans, Total	270,188us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember	248,893us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	3,546fmb_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember
Maturity schedule by major category of loans, After One Year Within Five Years	14,289fmb_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember
Maturity schedule by major category of loans, After Five Years	33,060fmb_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember
Maturity schedule by major category of loans, Total	50,895us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember	44,301us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	11,118fmb_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember
Maturity schedule by major category of loans, After One Year Within Five Years	19,377fmb_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember
Maturity schedule by major category of loans, After Five Years	67,055fmb_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember
Maturity schedule by major category of loans, Total	97,550us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember	92,438us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	58,741fmb_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember
Maturity schedule by major category of loans, After One Year Within Five Years	36,159fmb_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember
Maturity schedule by major category of loans, After Five Years	5,226fmb_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember
Maturity schedule by major category of loans, Total	100,126us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember	99,498us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	47,831fmb_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember
Maturity schedule by major category of loans, After One Year Within Five Years	22,826fmb_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember
Maturity schedule by major category of loans, After Five Years	3,954fmb_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember
Maturity schedule by major category of loans, Total	74,611us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember	65,449us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	5,652fmb_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Maturity schedule by major category of loans, After One Year Within Five Years	14,265fmb_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Maturity schedule by major category of loans, After Five Years	4,360fmb_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Maturity schedule by major category of loans, Total	24,277us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember	21,406us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Industrial Development Bonds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity schedule by major category of loans, Within One Year	2,499fmb_MaturityScheduleByMajorCategoryOfLoansWithinOneYear / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember
Maturity schedule by major category of loans, After One Year Within Five Years	126fmb_MaturityScheduleByMajorCategoryOfLoansAfterOneYear / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember
Maturity schedule by major category of loans, After Five Years	2,073fmb_MaturityScheduleByMajorCategoryOfLoansAfterFiveYears / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember
Maturity schedule by major category of loans, Total	$ 4,698us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember	$ 4,358us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember

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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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