Debt Instrument, Exit Fee Percentage

No definition available.

Name:	ifcn_DebtInstrumentExitFeePercentage
Namespace Prefix:	ifcn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents number of mortgage loans on real estate with outstanding principal balance.

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansOnRealEstateNumberOfLoansOutstandingPrincipalBalance
Namespace Prefix:	ifcn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average interest rate on mortgage loans.

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansWeightedAverageInterestRate
Namespace Prefix:	ifcn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Mortgage Loans on Real Estate, New Mortgage Loans, Discount

+ References

No definition available.

+ Details

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

- Definition

Mortgage Loans on Real Estate, New Mortgage Loans, Expenses

+ References

No definition available.

+ Details

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

- Definition

Mortgage Loans on Real Estate, Number of Loans Acquired

+ References

No definition available.

+ Details

Name:	ifcn_MortgageLoansonRealEstateNumberofLoansAcquired
Namespace Prefix:	ifcn_
Data Type:	xbrli:integerItemType
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

Interest and fee income from mortgage loans considered to be held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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

- Definition

Amount, after allowance for bad debt, of mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

+ Details

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

- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

+ 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)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

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

- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ 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)
-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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Indicates the number of mortgages under each classification.

+ 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 210.12-29.3)
-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

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateNumberOfLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_MortgageLoansOnRealEstateLoanTypeAxis=ifcn_CurrentPeriodLoanOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=ifcn_FinancingReceivableinDefaultStatusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_MortgageReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateLoanTypeAxis=ifcn_CurrentPeriodLoanTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Period Type:

- Details

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MORTGAGE LOANS, NET (Details Textual)	3 Months Ended			9 Months Ended		12 Months Ended
MORTGAGE LOANS, NET (Details Textual)	Sep. 30, 2018 USD ($) Loan	Mar. 31, 2018	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Loan	Sep. 30, 2017 USD ($) Loan	Dec. 31, 2017 USD ($) Loan
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, net	$ 22,979,000			$ 22,979,000		$ 19,668,000
Mortgage loan income	709,000		$ 350,000	1,976,000	$ 402,000
Valuation allowance	(13,100,000)			$ (13,100,000)		$ (12,700,000)
Current Period Loan One [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans (in loans) \| Loan				2
Financing Receivable in Default Status [Member]
Mortgage Loans on Real Estate [Line Items]
Aggregate average principal and interest balance	$ 7,600,000			$ 7,600,000
Number of loans \| Loan	1			1
Nonperforming Financing Receivable [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans \| Loan	3			3		2
Mortgage Receivable [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans (in loans) \| Loan				6		4
Aggregate average principal and interest balance						$ 19,700,000
Valuation allowance						$ (12,700,000)
Number of loans acquired \| Loan					1
Annual interest rate of loans		8.50%
Discount on loans acquired					$ 7,000,000
Expenses of acquired loans					$ 200,000
Mortgage Receivable [Member] \| Current Period Loan One [Member]
Mortgage Loans on Real Estate [Line Items]
Discount on loans acquired				$ 13,100,000
Mortgage Receivable [Member] \| Current Period Loan Two [Member]
Mortgage Loans on Real Estate [Line Items]
Exit fee percentage	1.00%			1.00%
Discount on loans acquired				$ 3,000,000
Mortgage Receivable [Member] \| LIBOR [Member] \| Current Period Loan One [Member]
Mortgage Loans on Real Estate [Line Items]
Annual interest rate of loans				8.50%
Mortgage Receivable [Member] \| LIBOR [Member] \| Current Period Loan Two [Member]
Mortgage Loans on Real Estate [Line Items]
Annual interest rate of loans				6.00%
Mortgage Receivable [Member] \| LIBOR [Member] \| Minimum [Member] \| Current Period Loan Two [Member]
Mortgage Loans on Real Estate [Line Items]
Annual interest rate of loans				8.00%
Mortgage Receivable [Member] \| Performing Financing Receivable [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans (in loans) \| Loan				3		2
Interest rate	8.80%			8.80%		9.70%
Mortgage Receivable [Member] \| Nonperforming Financing Receivable [Member]
Mortgage Loans on Real Estate [Line Items]
Aggregate average principal and interest balance	$ 0			$ 0		$ 0
Number of loans \| Loan	2			2