MORTGAGE LOANS, NET (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Movement in Mortgage Loans On Real Estate Principal Amount [Roll Forward]
Principal Outstanding, Beginning Balances	$ 12,601	$ 23,592
Principal Outstanding, Additions:
Mortgage loans acquired through recoveries	19,875
Interest adjustment	258
Accrued interest revenue	0	0
Principal Outstanding, Reductions:
Principal and interest repayments	0	(7,843)
Elimination of loan upon consolidation	(289)
Mortgage loan discount	(625)
Sale of mortgage loans		(3,148)
Principal Outstanding, Ending Balances	31,820	12,601
Movement in Mortgage Loans On Real Estate Interest Receivable [Roll Forward]
Interest Receivable, Beginning Balances	459	447
Additions, Interest Receivable:
Mortgage loans acquired through recoveries	0
Interest adjustment	0
Accrued interest revenue	686	262
Reductions, Interest Receivable:
Principal and interest repayments	(495)	(111)
Elimination of loan upon consolidation	(120)
Mortgage loan discount	0
Sale of mortgage loans		(139)
Interest Receivable, Ending Balances	530	459
Movement in Allowance for Loan and Lease Losses, Real Estate [Roll Forward]
Valuation Allowance, Begining Balances	(12,682)	(12,892)
Valuation Allowance, Additions:
Elimination of loan upon consolidation	0
Mortgage loan discount	0
Mortgage loans acquired through recoveries	0
Interest adjustment	0
Accrued interest revenue	0	0
Valuation Allowance, Reductions:
Principal and interest repayments	0	210
Sale of mortgage loans		0
Valuation Allowance, Ending Balances	(12,682)	(12,682)
Movement in Mortgage Loans on Real Estate [Roll Forward]
Mortgage Loans, Beginning Balances, Carrying Value	378	11,147
Net Carrying Value, Additions :
Mortgage loans acquired through recoveries	19,875
Interest adjustment	258
Accrued interest revenue	686	262
Net Carrying Value, Reductions :
Principal and interest repayments	(495)	(7,744)
Elimination of loan upon consolidation	409
Mortgage loan discount	625
Sale of mortgage loans		(3,287)
Mortgage Loans, Ending Balances, Carrying Value	$ 19,668	$ 378

Allowance for Loan and Lease Losses, Real Estate, Accrued Interest Revenue

No definition available.

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Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Allowance for Loan and Lease Losses, Real Estate, Interest Adjustment

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Allowance for Loan and Lease Losses, Real Estate, Principal and Interest Repayments

+ References

No definition available.

+ Details

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Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Allowance for Loan and Lease Losses, Real Estate, Sales

+ References

No definition available.

+ Details

Name:	ifcn_AllowanceforLoanandLeaseLossesRealEstateSales
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loan on Real Estate, Collection of Interest

+ References

No definition available.

+ Details

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Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

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- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents the loans under mortgage on real estate, interest will be receivable during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Mortgage Loans On Real Estate Interest Receivable, Adjustment

+ References

No definition available.

+ Details

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Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

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Namespace Prefix:	ifcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Mortgage Loans On Real Estate Interest Receivable, Sales

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansOnRealEstateInterestReceivableSales
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This represents the outstanding principal amount of mortgage loans.

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansOnRealEstatePrincipalAmount
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Mortgage Loans On Real Estate Principal Amount, Accrued Interest

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansOnRealEstatePrincipalAmountAccruedInterest
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loans On Real Estate Principal Amount, Interest Adjustment

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansOnRealEstatePrincipalAmountInterestAdjustment
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loans On Real Estate Principal Amount, Sales

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansOnRealEstatePrincipalAmountSales
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage Loans On Real Estate Principal Fundings Asset Sale Financing

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansOnRealEstatePrincipalFundingsAssetSaleFinancing
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansOnRealEstateReductionsAbstract
Namespace Prefix:	ifcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansOnRealEstateReductionsPrincipalAbstract
Namespace Prefix:	ifcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansOnRealEstateReductionsValuationAllowanceAbstract
Namespace Prefix:	ifcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Accrued Interest Revenue

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateAccruedInterestRevenue
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Accrued Interest Revenue Carrying Value

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateAccruedInterestRevenueCarryingValue
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Consolidation

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateConsolidation
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Consolidation, Carrying Value

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateConsolidationCarryingValue
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Consolidation, Interest Receivable

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateConsolidationInterestReceivable
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Consolidation, Valuation Allowance

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateConsolidationValuationAllowance
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Loans Acquired in Modification Carrying Value

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateLoansAcquiredinModificationCarryingValue
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Mortgage Loan Discount

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateMortgageLoanDiscount
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Mortgage Loan Discount, Carrying Value

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateMortgageLoanDiscountCarryingValue
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Mortgage Loan Discount, Interest

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateMortgageLoanDiscountInterest
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Mortgage Loan Discount, Valuation Allowance

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateMortgageLoanDiscountValuationAllowance
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, New Mortgage Loans Assigned, Interest Receivable

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateNewMortgageLoansAssignedInterestReceivable
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, New Mortgage Loans Assigned, Principal Amount

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateNewMortgageLoansAssignedPrincipalAmount
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, New Mortgage Loans Assigned, Valuation Allowance

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateNewMortgageLoansAssignedValuationAllowance
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Principal and Interest Repayments, Carrying Value

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstatePrincipalandInterestRepaymentsCarryingValue
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Sales

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateSales
Namespace Prefix:	ifcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Movement in Allowance for Loan and Lease Losses, Real Estate [Roll Forward]

+ References

No definition available.

+ Details

Name:	ifcn_MovementinAllowanceforLoanandLeaseLossesRealEstateRollForward
Namespace Prefix:	ifcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Movement in Mortgage Loans On Real Estate Interest Receivable [Roll Forward]

+ References

No definition available.

+ Details

Name:	ifcn_MovementinMortgageLoansOnRealEstateInterestReceivableRollForward
Namespace Prefix:	ifcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Movement in Mortgage Loans On Real Estate Principal Amount [Roll Forward]

+ References

No definition available.

+ Details

Name:	ifcn_MovementinMortgageLoansOnRealEstatePrincipalAmountRollForward
Namespace Prefix:	ifcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total carrying amount of mortgage loans as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.6)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of principal collected on mortgage loans on real estate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.6)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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