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SALE OF COMMERCIAL REAL ESTATE BUSINESS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 25, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business divestiture-related gains (losses)		$ (278,559)	$ 0	$ 0
Assets of disposal group held for sale		194,138	0
Liabilities of disposal group held for sale		154,956	0
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
Goodwill, impairment loss		71,800
Reversal of loan loss provision	$ 135,000
Unfunded loan commitments	$ 5,100
Pretax loss		(31,600)	$ (99,600)
Assets of disposal group held for sale		194,100
Liabilities of disposal group held for sale		154,900
Real Estate Property Excluded From Slate Transaction | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business divestiture-related gains (losses)		$ 4,800

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