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Borrowings Schedule of Borrowings (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Schedule of Borrowings [Line Items]    
Advances from Federal Home Loan Banks $ 20,000,000us-gaap_AdvancesFromFederalHomeLoanBanks $ 20,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
Junior subordinated debentures 20,620,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust 20,620,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
Short Term and Long Term Borrowings 162,489,000fmbh_ShortTermAndLongTermBorrowings 159,807,000fmbh_ShortTermAndLongTermBorrowings
Securities Sold under Agreements to Repurchase [Member]    
Schedule of Borrowings [Line Items]    
Short-term Debt $ 121,869,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		 $ 119,187,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember