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SALE OF COMMERCIAL REAL ESTATE BUSINESS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 25, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business divestiture-related gains (losses)	$ 1,527		$ 0	$ (248,036)	$ 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
Business divestiture-related gains (losses)	1,500			(248,000)
Goodwill, Impairment Loss		$ 71,800
Reversal of loan loss provision		135,000
Unfunded commitments		$ 5,100
Pretax loss	42,000		$ (66,900)	$ (30,700)	$ (162,300)
Real Estate Property Excluded From Slate Transaction | Disposal Group, Disposed of by Sale, Not Discontinued Operations
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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