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Acquisition/Disposition of Noncontrolling Interest (Details) (USD $)
1 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Jul. 31, 2013
Jan. 31, 2013
Jun. 30, 2012
Sep. 30, 2013
Dec. 31, 2012
item
Dec. 31, 2010
Jul. 02, 2013
Acquisition of noncontrolling interest                    
Amount paid for transfer of remaining ownership     $ 350,000us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries              
Cash consideration received on sale of business 10,200,000us-gaap_ProceedsFromDivestitureOfBusinesses 10,200,000us-gaap_ProceedsFromDivestitureOfBusinesses                
Gain on sale of business 1,200,000us-gaap_GainLossOnSaleOfBusiness 1,208,000us-gaap_GainLossOnSaleOfBusiness                
Proceeds on sale of business used to reduce legacy repurchase liability 3,000,000imh_ProceedsFromDivestitureOfBusinessesUsedToReduceLegacyRepurchaseLiability                  
AmeriHome                    
Acquisition of noncontrolling interest                    
Percentage of ownership interest in acquiree for which option to purchase is available in the purchase agreement               39.00%imh_BusinessAcquisitionCallOptionPurchasedToPurchaseAdditionalPercentageOfOwnershipInterestInAcquiree
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
39.00%imh_BusinessAcquisitionCallOptionPurchasedToPurchaseAdditionalPercentageOfOwnershipInterestInAcquiree
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
 
Multiplier at which option to purchase ownership interest in acquiree is available in purchase agreement               1.5imh_BusinessAcquisitionCallOptionMultiplierForPurchaseOfAdditionalPercentageOfOwnershipInterestInAcquiree
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
   
Maximum amount considered for purchase of ownership interest in acquiree available in purchase agreement               5,000,000imh_BusinessAcquisitionCallOptionMaximumAmountForPurchaseOfAdditionalPercentageOfOwnershipInterestInAcquiree
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
   
Additional cash to be paid for purchase of ownership interest in acquiree available in purchase agreement               550,000imh_BusinessAcquisitionCallOptionAdditionalCashToBePaidForPurchaseOfAdditionalPercentageOfOwnershipInterestInAcquiree
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
   
Option term               3 years    
Percentage of ownership interest in acquiree that can be sold by the noncontrolling interest holder to the company               49.00%imh_BusinessAcquisitionPutOptionWrittenToPurchaseAdditionalPercentageOfOwnershipInterestInAcquiree
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
49.00%imh_BusinessAcquisitionPutOptionWrittenToPurchaseAdditionalPercentageOfOwnershipInterestInAcquiree
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
 
Maximum amount at which ownership interest in acquiree that can be sold by the noncontrolling interest holder to the company               5,000,000imh_BusinessAcquisitionPutOptionMaximumAmountWrittenToPurchaseAdditionalPercentageOfOwnershipInterestInAcquiree
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
   
Ownership interest agreed to be acquired (as a percent)         1.50%imh_BusinessAcquisitionPercentageOfOwnershipInterestAgreedToBeAcquiredInAcquiree
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
27.50%imh_BusinessAcquisitionPercentageOfOwnershipInterestAgreedToBeAcquiredInAcquiree
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
       
Transfer of remaining ownership (as a percent)       20.00%imh_MinorityInterestDecreaseFromPurchaseOfInterestPercentage
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
    20.00%imh_MinorityInterestDecreaseFromPurchaseOfInterestPercentage
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
     
Amount paid for transfer of remaining ownership       350,000us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
           
IMH common stock issued for settlement       1,100,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
           
Ownership interest (as a percent)                   100.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
IRES | AmeriHome                    
Acquisition of noncontrolling interest                    
Ownership interest acquired (as a percent)               51.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
/ dei_LegalEntityAxis
= imh_IntegratedRealEstateServiceCorporationMember
   
Cash payment               1,100,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
/ dei_LegalEntityAxis
= imh_IntegratedRealEstateServiceCorporationMember
   
Note payable incurred               $ 720,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= imh_AmeriHomeMortgageCorporationMember
/ dei_LegalEntityAxis
= imh_IntegratedRealEstateServiceCorporationMember