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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Commercial Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Distribution of fixed rate loans by major loan category, Fixed Rate | $ 190,948 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate | 79,240 us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Agricultural Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Distribution of fixed rate loans by major loan category, Fixed Rate | 36,168 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate | 14,727 us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember
Consumer Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Distribution of fixed rate loans by major loan category, Fixed Rate | 77,534 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember
Distribution of variable rate loans by major loan category, Variable Rate | 20,016 us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember
Commercial and Industrial [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Distribution of fixed rate loans by major loan category, Fixed Rate | 76,625 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember
Distribution of variable rate loans by major loan category, Variable Rate | 23,501 us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember
Agricultural [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Distribution of fixed rate loans by major loan category, Fixed Rate | 69,707 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember
Distribution of variable rate loans by major loan category, Variable Rate | 4,904 us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember
Consumer Master Card and Overdrafts [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Distribution of fixed rate loans by major loan category, Fixed Rate | 19,566 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_ConsumerMasterCardAndOverdraftsMember
Distribution of variable rate loans by major loan category, Variable Rate | 4,711 us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_ConsumerMasterCardAndOverdraftsMember
Industrial Development Bonds [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Distribution of fixed rate loans by major loan category, Fixed Rate | 4,529 us-gaap_LoansReceivableWithFixedRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember
Distribution of variable rate loans by major loan category, Variable Rate | $ 169 us-gaap_LoansReceivableWithVariableRatesOfInterest1 / us-gaap_FinancialInstrumentAxis = fmb_IndustrialDevelopmentBondsMember

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- Definition Amount of loan with fixed rate of interest. + 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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- Definition Amount of loan with variable or adjustable rate of interest. + 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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