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Repurchase Agreements and Other Borrowings (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Repurchase Agreements and Other Borrowings [Abstract]    
Securities sold under agreements to repurchase $ 116,596,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 121,869,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Securities Sold under Agreements to Repurchase Increase (Decrease) 5,300,000fmbh_SecuritiesSoldUnderAgreementsToRepurchaseIncreaseDecrease  
Federal Home Loan Bank Advances Short and Long Term, Increase (Decrease) 5,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTermIncreaseDecrease  
FHLB borrowings 25,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm 20,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
Debt Instrument [Line Items]    
FHLB borrowings 25,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm 20,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
FHLB Advance, 2-Year Maturity [Member]    
Repurchase Agreements and Other Borrowings [Abstract]    
FHLB borrowings 5,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBAdvance2YearMaturityMember
 
Debt Instrument [Line Items]    
FHLB borrowings 5,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBAdvance2YearMaturityMember
 
Federal Home Loan Bank Advances, Original Maturity Term 2-year maturity  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 0.57%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBAdvance2YearMaturityMember
 
FHLB advance, 10-Year Maturity [Member]    
Repurchase Agreements and Other Borrowings [Abstract]    
FHLB borrowings 5,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBadvance10YearMaturityMember
 
Debt Instrument [Line Items]    
FHLB borrowings 5,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBadvance10YearMaturityMember
 
Federal Home Loan Bank Advances, Original Maturity Term 10-year maturity  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 4.58%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBadvance10YearMaturityMember
 
FHLB advance, 6-Year Maturity [Member]    
Repurchase Agreements and Other Borrowings [Abstract]    
FHLB borrowings 5,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBadvance6YearMaturityMember
 
Debt Instrument [Line Items]    
FHLB borrowings 5,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBadvance6YearMaturityMember
 
Federal Home Loan Bank Advances, Original Maturity Term 6-year maturity  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 2.30%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBadvance6YearMaturityMember
 
FHLB Advance, 7 Year Maturity [Member]    
Repurchase Agreements and Other Borrowings [Abstract]    
FHLB borrowings 5,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBAdvance7YearMaturityMember
 
Debt Instrument [Line Items]    
FHLB borrowings 5,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBAdvance7YearMaturityMember
 
Federal Home Loan Bank Advances, Original Maturity Term 7-year maturity  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 2.55%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBAdvance7YearMaturityMember
 
FHLB advance, 8-Year Maturity [Member]    
Repurchase Agreements and Other Borrowings [Abstract]    
FHLB borrowings 5,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBadvance8YearMaturityMember
 
Debt Instrument [Line Items]    
FHLB borrowings $ 5,000,000fmbh_FederalHomeLoanBankAdvancesShortAndLongTerm
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBadvance8YearMaturityMember
 
Federal Home Loan Bank Advances, Original Maturity Term 8-year maturity  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 2.40%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
/ us-gaap_DebtInstrumentAxis
= fmbh_FHLBadvance8YearMaturityMember