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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch).

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REAL ESTATE AND OTHER SECURITIES - Summary of Real Estate Securities in an Unrealized Loss Position (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 24,314,300	$ 31,869,682
Credit Impairment - Amortized Cost Basis			$ (59,063)	$ (52,803)
Weighted Average Life (Years)	1 year 3 months 18 days
Less than 12 Months
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 3,755
Before Impairment - Amortized Cost Basis	3,535
Credit Impairment - Amortized Cost Basis	(20)
After Credit Impairment - Amortized Cost Basis	3,514
Gross Unrealized Losses - Less than Twelve Months	(24)
Carrying Value - Less than Twelve Months	$ 3,490
Number of Securities - Less than Twelve Months \| security	2
Weighted Average Rating	AAA
Weighted Average Coupon	1.60%
Weighted Average Yield	1.34%
Weighted Average Life (Years)	2 years 4 months 24 days
12 or More Months
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 19,723
Before Impairment - Amortized Cost Basis	10,563
Credit Impairment - Amortized Cost Basis	(3,451)
After Credit Impairment - Amortized Cost Basis	7,111
Gross Unrealized Losses - Twelve or More Months	(93)
Carrying Value - Twelve or More Months	$ 7,018
Number of Securities - Twelve or More Months \| security	13
Weighted Average Rating	AA+
Weighted Average Coupon	0.00%
Weighted Average Yield	0.89%
Weighted Average Life (Years)	4 months 24 days
Total/Weighted Average
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 23,478
Before Impairment - Amortized Cost Basis	14,098
Credit Impairment - Amortized Cost Basis	(3,471)
After Credit Impairment - Amortized Cost Basis	10,625
Gross Unrealized Losses - Total/Weighted Average	(117)
Carrying Value - Total/Weighted Average	$ 10,508
Number of Securities - Total/Weighted Average \| security	15
Weighted Average Rating	AAA
Weighted Average Coupon	0.53%
Weighted Average Yield	1.04%
Weighted Average Life (Years)	1 year