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SECURITIES - Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
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Unrealized Loss Position For: |  |  |  |
Estimated Fair Value | [1] | $ 66,500,689 | $ 69,613,565 | [2]
Gross Unrealized Losses |  | (2,519,687) | (2,230,646) |
Agency Mortgage-Backed Securities |  |  |  |
Unrealized Loss Position For: |  |  |  |
Estimated Fair Value |  | 11,659,329 | 15,490,571 |
Gross Unrealized Losses |  | $ (1,286,282) | $ (1,340,450) |
Number of Securities | security |  | 1,616 | 1,763 |
Agency Mortgage-Backed Securities | Less than 12 months |  |  |  |
Unrealized Loss Position For: |  |  |  |
Estimated Fair Value |  | $ 57,959 | $ 35,453 |
Gross Unrealized Losses |  | $ (1,241) | $ (418) |
Number of Securities | security |  | 40 | 16 |
Agency Mortgage-Backed Securities | 12 Months or more |  |  |  |
Unrealized Loss Position For: |  |  |  |
Estimated Fair Value |  | $ 11,601,370 | $ 15,455,118 |
Gross Unrealized Losses |  | $ (1,285,041) | $ (1,340,032) |
Number of Securities | security |  | 1,576 | 1,747 |
[1] | (3)Excludes $1.8 billion and $1.5 billion at March 31, 2024 and December 31, 2023, respectively, of non-Agency mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition.
[2] | (1)Derived from the audited consolidated financial statements at December 31, 2023.

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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 + Details
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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 + Details
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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 + Details
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