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SECURITIES - Unrealized Loss Position (Details) $ in Thousands		Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Unrealized Loss Position For:
Estimated Fair Value	[1]	$ 69,613,565	$ 65,789,907
Gross unrealized losses		(2,230,646)	(4,963,091)
Agency Mortgage-Backed Securities
Unrealized Loss Position For:
Estimated Fair Value		15,490,571	34,321,645
Gross unrealized losses		$ (1,340,450)	$ (3,714,806)
Number of securities | security		1,763	2,610
Agency Mortgage-Backed Securities | Less than 12 months
Unrealized Loss Position For:
Estimated Fair Value		$ 35,453	$ 33,061,267
Gross unrealized losses		$ (418)	$ (3,448,120)
Number of securities | security		16	2,481
Agency Mortgage-Backed Securities | 12 Months or more
Unrealized Loss Position For:
Estimated Fair Value		$ 15,455,118	$ 1,260,378
Gross unrealized losses		$ (1,340,032)	$ (266,686)
Number of securities | security		1,747	129
[1] (2) Excludes $1.5 billion and $1.0 billion at December 31, 2023 and 2022, respectively, of non-Agency mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition.

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- Definition

Mortgage-Backed Securities in a continuous unrealized loss position [Line Items]

+ References

No definition available.

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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-4

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