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Basis of Accounting and Consolidation Basis of Accounting and Consolidation 1 (Details)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum number of shares to be issued in stock incentive plan (in shares) 300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized  
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock awarded in SI plan (in shares) 59,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		  
Stock Unit Awards and Stock Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock awarded in SI plan (in shares) 16,604us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember		 19,377us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
Stock Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of Awards Issued (in hundredths) 50.00%fmbh_PercentageOfAwardsIssued
/ us-gaap_AwardTypeAxis
= fmbh_StockAwardsMember		  
Stock Unit Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of Awards Issued (in hundredths) 50.00%fmbh_PercentageOfAwardsIssued
/ us-gaap_AwardTypeAxis
= fmbh_StockUnitAwardsMember