VARIABLE INTEREST ENTITIES VARIABLE INTEREST ENTITIES - INTANGIBLE ASSETS (Mortgage Servicing Rights) (Details) (RSO [Member], USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Expected amortization, 2015	$ 2,100,000
Expected amortization, 2016	2,000,000
Expected amortization, 2017	1,800,000
Expected amortization, 2018	1,800,000
Expected amortization, 2019	1,600,000
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of Period		24,303,000
Balance, end of period	21,813,000	24,303,000
Accumulated amortization	12,077,000	12,481,000
Balance, end of period	9,736,000us-gaap_FiniteLivedIntangibleAssetsNet	11,822,000us-gaap_FiniteLivedIntangibleAssetsNet
Servicing Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Mortgage Servicing Rights (MSRs)	1,600,000
Expected amortization, 2015	2,000,000
Expected amortization, 2016	2,000,000
Expected amortization, 2017	1,800,000
Expected amortization, 2018	1,700,000
Expected amortization, 2019	1,100,000
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of Period	433,153,000
Additions	519,915,000
Payoffs, sales and curtailments	(58,301,000)
Balance, end of period	894,767,000
Other Assets [Member] \| Servicing Contracts [Member]
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of Period	4,885,000
Additions	6,446,000
Sales	0
Balance, end of period	11,331,000
Accumulated amortization	2,457,000
Balance, end of period	8,874,000
Other Income [Member] \| Servicing Contracts [Member]
Finite-lived Intangible Assets [Roll Forward]
Servicing fees from capitalized portfolio	1,649,000
Late Fees	81,000
Other ancillary servicing revenue	$ 6,000

Finite-Lived Intangible Assets, Payoffs, Sales, and Curtailments

No definition available.

Name:	rexi_FiniteLivedIntangibleAssetsPayoffsSalesandCurtailments
Namespace Prefix:	rexi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

+ Details

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

- Definition

All amounts that are due to the servicer of a financial asset, excluding contractually specified servicing fees and late fees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746

+ Details

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

- Definition

All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

+ References

+ Details

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

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References