FAIR VALUE (Additional Information About Assets Which Were Measured at Fair Value on a Recurring Basis Utilizing Level 3 Inputs) (Details) (Investment Securities [Member], Recurring Basis [Member], Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2013
Investment Securities [Member] \| Recurring Basis [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 8,489
Purchases	611	15,063
Income accreted	288	995
Payments and distributions received, net	(455)	(3,752)
Sales	(175)	(13,251)
Gain on sale of investment securities, net		445
Unrealized losses on trading securities	(15)	(200)
Unrealized holding gains on trading securities	20	1,850
Change in unrealized gains (losses) included in accumulated other comprehensive loss	(50)	(68)
Ending balance	$ 8,713	$ 7,407

FAIR VALUE (Additional Information About Assets Which Were Measured at Fair Value on a Recurring Basis Utilizing Level 3 Inputs) (Details) (Investment Securities [Member], Recurring Basis [Member], Level 3 [Member], USD $)
In Thousands, unless otherwise specified

3 Months Ended

12 Months Ended

Mar. 31, 2015

Dec. 31, 2013

Investment Securities [Member] | Recurring Basis [Member] | Level 3 [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]

Beginning balance

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Purchases

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Income accreted

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Payments and distributions received, net

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Sales

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Gain on sale of investment securities, net

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Unrealized losses on trading securities

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Unrealized holding gains on trading securities

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1,850rexi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTradingSecuritiesUnrealizedHoldingGainAndInterest
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Change in unrealized gains (losses) included in accumulated other comprehensive loss

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Ending balance

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$ 7,407us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
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- Definition

Amount of income accreted arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

No definition available.

+ Details

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Other than Temporary Impairment Losses, Investments, Recognized in Earnings

+ References

No definition available.

+ Details

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- Definition

The increase (decrease) resulting in a gain from the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, and interest that was included in earnings for the period.

+ References

No definition available.

+ Details

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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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