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Related Party Transactions - Additional Information (Detail) (Directors and Executive Officers [Member], USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Directors and Executive Officers [Member]
    
Related Party Transaction [Line Items]    
Granted loans to affiliate companies $ 1,500,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fmb_DirectorsAndExecutiveOfficersMember		 $ 5,900,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fmb_DirectorsAndExecutiveOfficersMember
New loans approved 428,000fmb_RelatedPartyTransactionNewLoanIssueToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fmb_DirectorsAndExecutiveOfficersMember		  
Subsequent advances 10,100,000fmb_GrantOfSubsequentAdvances
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fmb_DirectorsAndExecutiveOfficersMember		  
Payment received 10,600,000fmb_RelatedPartyTransactionDueFromPartyAmountReceivedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fmb_DirectorsAndExecutiveOfficersMember		  
Difference in related borrowings amounts 502,000fmb_DifferenceBetweenRelatedPartyDepositAndLoanLendingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fmb_DirectorsAndExecutiveOfficersMember		  
Ownership interest amount $ 26,100,000fmb_RelatedPartyOwnershipAmountInConcernEntity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fmb_DirectorsAndExecutiveOfficersMember		 $ 22,300,000fmb_RelatedPartyOwnershipAmountInConcernEntity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fmb_DirectorsAndExecutiveOfficersMember