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Represents the write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt and noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments.

No definition available.

Name:	imh_AmortizationOfDebtIssuanceCostAndDebtDiscountPremium
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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) and other assets in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

No definition available.

Name:	imh_AmortizationOfIntangibleAndOtherAssets
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The cash inflow from borrowings under mortgage servicing rights financing.

No definition available.

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The cash inflow from a borrowing of warehouse having initial term of repayment within one year or the normal operating cycle, if longer.

No definition available.

Name:	imh_BorrowingsUnderWarehouseAgreement
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This element represents gains (losses) from real estate owned at the time of sale or losses from further write-downs.

No definition available.

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Amount of gain (loss) on sale or disposal of mortgage servicing rights (MSRs).

No definition available.

Name:	imh_GainLossOnSaleOfMortgageServicingRights
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Represents the change in fair value of derivatives lending, net during the reporting period.

No definition available.

Name:	imh_IncreaseDecreaseInFairValueOfDerivativesLendingNet
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This element represents change in fair value of long-term debt during the reporting period.

No definition available.

Name:	imh_IncreaseDecreaseInFairValueOfLongTermDebt
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Data Type:	xbrli:monetaryItemType
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The increase (decrease) during the reporting period in the fair value of mortgage loans or securitized loans that are held with the intention to sell in the near future.

No definition available.

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This element represents change in fair value of trust assets excluding real estate owned due to decreases in the fair value of investment securities-for-sale and of securitized mortgage collateral during the reporting period.

No definition available.

Name:	imh_IncreaseDecreaseInFairValueOfNetTrustAssetsExcludingRealEstateOwned
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Data Type:	xbrli:monetaryItemType
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Present value of lessee's discounted obligation for lease payments from operating lease.

No definition available.

Name:	imh_InitialRecognitionOfOperatingLeaseLiabilities
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Amount of lessee's right to use underlying asset under operating lease.

No definition available.

Name:	imh_InitialRecognitionOfOperatingLeaseRightOfUseAssets
Namespace Prefix:	imh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents mortgage servicing rights retained from loan sales and issuance of mortgage backed securities during the reporting period in a noncash transaction.

No definition available.

Name:	imh_MortgageServicingRightsRetainedFromLoanSalesAndIssuanceOfMortgageBackedSecurities
Namespace Prefix:	imh_
Data Type:	xbrli:monetaryItemType
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This element represents net change during the reporting period in securitized mortgage collateral.

No definition available.

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Namespace Prefix:	imh_
Data Type:	xbrli:monetaryItemType
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Amount of the current period expense charged against operations with respect to provision or recovery of previously charged amount.

No definition available.

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Recognition of cash surrender value of corporate-owned life insurance in noncash investing or financing activities.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Recognition of corporate-owned life insurance trusts in noncash investing and financing activities.

No definition available.

Name:	imh_RecognitionOfCorporateOwnedLifeInsuranceTrusts
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Data Type:	xbrli:monetaryItemType
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The cash outflow for a borrowing of warehouse having initial term of repayment within one year or the normal operating cycle, if longer.

No definition available.

Name:	imh_RepaymentOfWarehouseBorrowings
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Data Type:	xbrli:monetaryItemType
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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash outflow for principal payment on finance lease.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of increase (decrease) in operating assets classified as other.

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Amount of increase (decrease) in operating liabilities classified as other.

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The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Name:	us-gaap_MortgageServicingRightsMSRImpairmentRecovery
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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Name:	us-gaap_NetCashProvidedByUsedInFinancingActivities
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Balance Type:	debit
Period Type:	duration

No definition available.

Name:	us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract
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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

Name:	us-gaap_NetCashProvidedByUsedInInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

Name:	us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract
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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Name:	us-gaap_NetCashProvidedByUsedInOperatingActivities
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No definition available.

Name:	us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract
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The amount of cash paid for the origination of mortgages that are held for sale.

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Name:	us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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The net cash outflow or inflow from purchases, sales and disposals of property, plant and equipment and other productive assets, including intangibles.

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Name:	us-gaap_PaymentsForProceedsFromProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of cash outflow for purchase of mortgage-backed security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Name:	us-gaap_PaymentsToAcquireMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale
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Amount of cash inflow (outflow) from long-term debt wholly or partially secured by collateral. Excludes tax exempt secured debt.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of noncash expense for share-based payment arrangement.

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No definition available.

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586