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

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- Definition Maturity schedule by major category of loans after one year. + References No definition available. + Details
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- Definition Maturity schedule by major category of loans within one year. + References No definition available. + Details
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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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