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LOANS - Additional Data On Residential Mortgage Loans (Details) - Residential Mortgage Loans $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) point	Dec. 31, 2020 USD ($) point
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 5,602,342	$ 3,482,865
Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 1	$ 1
Interest rate	0.50%	0.50%
FICO score at loan origination | point	604	505
Loan-to-value ratio at loan origination	8.00%	8.00%
Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 4,382	$ 3,448
Interest rate	9.24%	9.24%
FICO score at loan origination | point	829	829
Loan-to-value ratio at loan origination	103.00%	104.00%
Weighted Average
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 517	$ 473
Interest rate	4.25%	4.89%
FICO score at loan origination | point	761	755
Loan-to-value ratio at loan origination	66.00%	67.00%

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- Definition

FICO score.

+ References

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- Definition

Investment Interest Rate, Percentage

+ References

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- Definition

Loan To Value Percentage

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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