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Servicing - Summary of Mortgage Servicing Rights Capitalized and Amortized (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Servicing Assets at Fair Value [Line Items] |  |
End of Year | $ 2,023 us-gaap_ServicingAssetAtAmortizedValue | $ 2,066 us-gaap_ServicingAssetAtAmortizedValue
Mortgage Servicing Rights [Member] |  |
Servicing Assets at Fair Value [Line Items] |  |
Beginning Year | 2,066 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_ParticipatingMortgageLoansAxis = fmb_MortgageServicingRightsMember | 2,063 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_ParticipatingMortgageLoansAxis = fmb_MortgageServicingRightsMember
Capitalized Additions | 301 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_ParticipatingMortgageLoansAxis = fmb_MortgageServicingRightsMember | 429 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_ParticipatingMortgageLoansAxis = fmb_MortgageServicingRightsMember
Amortization | (344)us-gaap_ServicingAssetAtAmortizedValueAmortization1 / us-gaap_ParticipatingMortgageLoansAxis = fmb_MortgageServicingRightsMember | (426)us-gaap_ServicingAssetAtAmortizedValueAmortization1 / us-gaap_ParticipatingMortgageLoansAxis = fmb_MortgageServicingRightsMember
Valuation Allowance | 0 us-gaap_ServicingAssetAtAmortizedValueValuationAllowance / us-gaap_ParticipatingMortgageLoansAxis = fmb_MortgageServicingRightsMember | 0 us-gaap_ServicingAssetAtAmortizedValueValuationAllowance / us-gaap_ParticipatingMortgageLoansAxis = fmb_MortgageServicingRightsMember
End of Year | $ 2,023 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_ParticipatingMortgageLoansAxis = fmb_MortgageServicingRightsMember | $ 2,066 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_ParticipatingMortgageLoansAxis = fmb_MortgageServicingRightsMember

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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of amortization of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of valuation allowance applied to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |