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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Contract | Dec. 31, 2013 Contract
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified, Troubled Debt Restructurings | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember
Pre- Modification Outstanding Recorded Investment | $ 0 fmb_FinancingReceivableModificationsPreModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember | $ 0 fmb_FinancingReceivableModificationsPreModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember
Post- Modification Outstanding Recorded Investment | 0 fmb_FinancingReceivableModificationsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember | 0 fmb_FinancingReceivableModificationsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember
Number of Contracts Modified, Troubled Debt Restructurings That Subsequently Defaulted | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember
Recorded Investment | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember
Agricultural Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified, Troubled Debt Restructurings | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_AgricultureRealEstateMember | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_AgricultureRealEstateMember
Pre- Modification Outstanding Recorded Investment | 0 fmb_FinancingReceivableModificationsPreModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_AgricultureRealEstateMember | 0 fmb_FinancingReceivableModificationsPreModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_AgricultureRealEstateMember
Post- Modification Outstanding Recorded Investment | 0 fmb_FinancingReceivableModificationsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_AgricultureRealEstateMember | 0 fmb_FinancingReceivableModificationsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_AgricultureRealEstateMember
Number of Contracts Modified, Troubled Debt Restructurings That Subsequently Defaulted | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_AgricultureRealEstateMember | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_AgricultureRealEstateMember
Recorded Investment | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_AgricultureRealEstateMember | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_AgricultureRealEstateMember
Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified, Troubled Debt Restructurings | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_CommercialAndIndustrialMember | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_CommercialAndIndustrialMember
Pre- Modification Outstanding Recorded Investment | 0 fmb_FinancingReceivableModificationsPreModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_CommercialAndIndustrialMember | 0 fmb_FinancingReceivableModificationsPreModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_CommercialAndIndustrialMember
Post- Modification Outstanding Recorded Investment | 0 fmb_FinancingReceivableModificationsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_CommercialAndIndustrialMember | 0 fmb_FinancingReceivableModificationsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_CommercialAndIndustrialMember
Number of Contracts Modified, Troubled Debt Restructurings That Subsequently Defaulted | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_CommercialAndIndustrialMember | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_CommercialAndIndustrialMember
Recorded Investment | $ 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_CommercialAndIndustrialMember | $ 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fmb_CommercialAndIndustrialMember

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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