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Commitments and Contingencies (Continuing and Discontinued Operations) (Details 2) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Lease commitments for operating leases    
Year 2015 $ 7,851,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent  
Year 2016 6,519,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears  
Subtotal 14,370,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue  
Sublet income (5,407,000)us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals  
Total lease commitments 8,963,000imh_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentals  
Lease commitments for capital leases    
Year 2015 728,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent  
Year 2016 357,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears  
Year 2017 68,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears  
Year 2018 34,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears  
Year 2019 and thereafter 23,000imh_CapitalLeasesFutureMinimumPaymentsDueInFifthYearAndThereafter  
Subtotal 1,210,000us-gaap_CapitalLeasesFutureMinimumPaymentsDue  
Lease Commitments    
Year 2015 8,579,000us-gaap_ContractualObligationDueInNextTwelveMonths  
Year 2016 6,876,000us-gaap_ContractualObligationDueInSecondYear  
Year 2017 68,000us-gaap_ContractualObligationDueInThirdYear  
Year 2018 34,000us-gaap_ContractualObligationDueInFourthYear  
Year 2019 and thereafter 23,000imh_ContractualObligationDueInFifthYearAndThereafter  
Subtotal 15,580,000us-gaap_ContractualObligation  
Sublet income (5,407,000)imh_ContractualObligationFutureMinimumSubleaseRentals  
Total lease commitments 10,173,000imh_ContractualObligationNetOfSubleaseRentals  
Rental expense    
Rental expense incurred 5,000,000us-gaap_OperatingLeasesRentExpenseNet 5,800,000us-gaap_OperatingLeasesRentExpenseNet
Increase in expected minimum future lease payments 681,000imh_IncreaseDecreaseInEstimatedFutureMinimumLeasePayments 202,000imh_IncreaseDecreaseInEstimatedFutureMinimumLeasePayments
Interest expense on capital leases 72,000us-gaap_CapitalLeasesIncomeStatementInterestExpense 58,000us-gaap_CapitalLeasesIncomeStatementInterestExpense
Continuing operations    
Rental expense    
Rental expense incurred $ 4,800,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
$ 5,700,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember