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LOANS - Investment Loan Activity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning balance January 1, 2021	$ 3,083,821	[1]
Ending balance December 31, 2021	4,242,043	[1]
Transfer of residential loans to securitization vehicles, carrying value, noncash	3,900,000
Total
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning balance January 1, 2021	3,083,821
Purchases / originations	8,287,944
Sales and transfers	(6,367,392)
Principal payments	(828,547)
Gains / (losses)	62,723
(Amortization) / accretion	2,514
Ending balance December 31, 2021	4,241,063
Residential
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning balance January 1, 2021	345,810
Purchases / originations	6,120,021
Sales and transfers	(4,084,742)
Principal payments	(81,677)
Gains / (losses)	(16,693)
(Amortization) / accretion	(10,647)
Ending balance December 31, 2021	2,272,072
Commercial
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning balance January 1, 2021	498,081
Purchases / originations	126,722
Sales and transfers	(608,202)
Principal payments	(84,929)
Gains / (losses)	67,784
(Amortization) / accretion	544
Ending balance December 31, 2021	0
Corporate Debt
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning balance January 1, 2021	2,239,930
Purchases / originations	1,572,718
Sales and transfers	(1,205,965)
Principal payments	(661,941)
Gains / (losses)	11,632
(Amortization) / accretion	12,617
Ending balance December 31, 2021	1,968,991
Corporate Debt Held for Sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning balance January 1, 2021	0
Purchases / originations	468,483
Sales and transfers	(468,483)
Principal payments	0
Gains / (losses)	0
(Amortization) / accretion	0
Ending balance December 31, 2021	$ 0
[1] (3) Includes $2.3 million and $47.0 million of residential mortgage loans held for sale at December 31, 2021 and 2020, respectively.

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Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 6
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
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-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
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