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Summary of Significant Accounting Policies Summary of Significant Accounting Policies 4 (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
trust_accounts
Dec. 31, 2013
trust_accounts
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Number of Trust Accounts managed or administered 1,478fmbh_NumberOfTrustAccountsManagedOrAdministered 1,498fmbh_NumberOfTrustAccountsManagedOrAdministered
Value of Trust Accounts $ 757.3fmbh_ValueOfTrustAccounts $ 722.9fmbh_ValueOfTrustAccounts