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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | $ 841 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue | $ 806 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue |
60-89 Days Past Due | 270 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue | 2 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue |
Greater Than 90 Days | 1,174 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue | 633 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue |
Total Past Due | 2,285 us-gaap_FinancingReceivableRecordedInvestmentPastDue | 1,441 us-gaap_FinancingReceivableRecordedInvestmentPastDue |
Current | 619,641 us-gaap_FinancingReceivableRecordedInvestmentCurrent | 574,672 us-gaap_FinancingReceivableRecordedInvestmentCurrent |
Total Financing Receivables | 621,926 fmb_FinancingReceivablesCurrentAndPastDue | 576,113 fmb_FinancingReceivablesCurrentAndPastDue |
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 713 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 778 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
60-89 Days Past Due | 50 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 0 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Greater Than 90 Days | 436 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 234 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Total Past Due | 1,199 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 1,012 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Current | 96,351 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 91,426 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Total Financing Receivables | 97,550 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 92,438 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Current | 50,895 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember | 44,301 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember |
Total Financing Receivables | 50,895 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember | 44,301 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember |
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 25 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |  |
Total Past Due | 25 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |  |
Current | 74,586 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember | 65,449 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |
Total Financing Receivables | 74,611 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember | 65,449 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 78 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |  |
60-89 Days Past Due | 204 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |  |
Greater Than 90 Days | 709 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 373 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Total Past Due | 991 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 373 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Current | 269,197 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 248,520 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Total Financing Receivables | 270,188 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 248,893 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
60-89 Days Past Due | 8 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |  |
Greater Than 90 Days |  | 26 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Total Past Due | 8 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 26 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Current | 104,816 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 103,830 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Total Financing Receivables | 104,824 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 103,856 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Recorded Investment > 90 Days and Accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 25 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 28 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
60-89 Days Past Due | 8 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 2 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Greater Than 90 Days | 29 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |  |
Total Past Due | 62 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 30 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Current | 23,796 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 21,146 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Total Financing Receivables | 23,858 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 21,176 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Recorded Investment > 90 Days and Accruing | $ 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | $ 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |

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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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