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SALE OF COMMERCIAL REAL ESTATE BUSINESS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 25, 2021	Dec. 31, 2020	[1]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets of disposal group held for sale	$ 238,042		$ 238,042			$ 0
Discontinued Operations, Held-for-sale | Level 3
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of long-lived assets to be disposed of	28,400
Discontinued Operations, Held-for-sale | Level 3 | Fair Value, Nonrecurring
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets of disposal group held for sale	52,700		52,700
CRE Business | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of business					$ 2,330,000
Pretax loss	5,900	$ 10,400	(24,800)	$ (151,900)
Assets of disposal group held for sale	$ 238,042		$ 238,042
[1] (1)Derived from the audited consolidated financial statements at December 31, 2020.

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