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Variable Interest Entities (Schedule Of Variable Interest Entities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Other Receivables | $ 2,323 | $ 2,329
Other Investments, at fair value | 35 | 77
Maximum Exposure to loss in non-consolidated VIEs | 2,358 | 2,406
Managed Variable Interest Entity [Member] |  |
Variable Interest Entity [Line Items] |  |
Other Receivables | 2,239 | 2,224
Maximum Exposure to loss in non-consolidated VIEs | 2,239 | 2,224
Third-Party Managed Variable Interest Entity [Member] |  |
Variable Interest Entity [Line Items] |  |
Other Receivables | 84 | 105
Other Investments, at fair value | 35 | 77
Maximum Exposure to loss in non-consolidated VIEs | $ 119 | $ 182

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- Definition Variable Interest Entity, Nonconsolidated, Other Investments + References No definition available. + Details
Name: | ifmi_VariableInterestEntityNonconsolidatedOtherInvestments
Namespace Prefix: | ifmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685 + Details
Name: | us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 + Details
Name: | us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant