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Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 false2Balance, end of period21true 7fmbh_EndingBalanceAllowanceForLoanLossesAbstractfmbh_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Ending Balance [Abstract]22false 8us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1us-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse439000439000USD$falsefalsefalse2truefalsefalse734000734000USD$falsefalsefalse3truefalsefalse439000439000USD$falsefalsefalse4truefalsefalse734000734000USD$falsefalsefalse5truefalsefalse511000511000USD$falsefalsefalse6truefalsefalse734000734000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 false2Individually evaluated for impairment23false 8us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairmentus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1169200011692000USD$falsefalsefalse2truefalsefalse1072100010721000USD$falsefalsefalse3truefalsefalse1169200011692000USD$falsefalsefalse4truefalsefalse1072100010721000USD$falsefalsefalse5truefalsefalse1126500011265000USD$falsefalsefalse6truefalsefalse1072100010721000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 false2Collectively evaluated for impairment24true 6us-gaap_LoansAndLeasesReceivableGrossCarryingAmountAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Loans [Abstract]25false 7fmbh_LoansAndLeasesReceivableNetOfDeferredIncomeAndOtherChargesfmbh_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse915813000915813000USD$falsefalsefalse2truefalsefalse845925000845925000USD$falsefalsefalse3truefalsefalse915813000915813000USD$falsefalsefalse4truefalsefalse845925000845925000USD$falsefalsefalse5truefalsefalse911065000911065000USD$falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount net of deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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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.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=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Gross loans46true 4us-gaap_LoansAndLeasesReceivableOtherInformationAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Loans Receivable Additional Information [Abstract]47false 5fmbh_DebtCoverageRatiofmbh_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse001.20xfalsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringThe ratio used to analyze the amount of debt that can be supported by the cash flow generated from the property. The calculation is the net income generated by the property divided by the commercial mortgage payment.No definition available.false0Debt coverage ratio48false 5fmbh_AmortizationPeriodOfLoansfmbh_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00twenty yearsfalsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalseus-types:durationStringItemTypenormalizedstringThe useful life of the loan receivable.No definition available.false0Amortization period of loans49false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse17false truefalseD2013Q2YTD_us-gaap_FinancialInstrumentAxis_us-gaap_CommercialRealEstateMember_us-gaap_RangeAxis_us-gaap_MinimumMemberhttp://www.sec.gov/CIK0000700565duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseCommercial real estateus-gaap_FinancialInstrumentAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialRealEstateMemberus-gaap_FinancialInstrumentAxisexplicitMemberfalsefalseMinimum [Member]us-gaap_RangeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MinimumMemberus-gaap_RangeAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli0nanafalse0Commercial real estate | Minimum [Member]50true 4us-gaap_LoansAndLeasesReceivableOtherInformationAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Loans Receivable Additional Information [Abstract]51false 5fmbh_LoanToValueRatiofmbh_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truetruefalse0.650.65falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsenum:percentItemTypepureThe amount of the mortgage loan as a percentage of the total appraised value of the real property. 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Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 false2Balance, beginning of period141false 7us-gaap_AllowanceForLoanAndLeaseLossesProvisionForLossGrossus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-3000-3000USD$falsefalsefalse2truefalsefalse7600076000USD$falsefalsefalse3truefalsefalse-145000-145000USD$falsefalsefalse4truefalsefalse100000100000USD$falsefalsefalse5truefalsefalse-47000-47000USD$falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryReflects the gross amount charged against earnings during the period as credit losses (bad debt expense) based on review of the loan and lease portfolio and application of the methodology for estimating credit losses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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