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Loans - Recorded Investment in Nonaccrual Loans by Portfolio Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans $ 1,705us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 3,329us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans 628us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= fmb_ConsumerRealEstateMember		 483us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= fmb_ConsumerRealEstateMember
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans 709us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember		 2,436us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans 339us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= fmb_CommercialAndIndustrialMember		 410us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= fmb_CommercialAndIndustrialMember
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans $ 29us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember