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

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- Definition Difference Between Related Party Deposit And Loan Lending Amount + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Grant Of Subsequent Advances + References No definition available. + Details
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Namespace Prefix: | fmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Related Party Ownership Amount In Concern Entity + References No definition available. + Details
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Namespace Prefix: | fmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related Party Transaction Due From Party Amount Received During Period + References No definition available. + Details
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Namespace Prefix: | fmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Related Party Transaction New Loan Issue To Related Party + References No definition available. + Details
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Namespace Prefix: | fmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration