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SECURITIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Unrealized gains (losses) on agency mortgage-backed securities | $ (2,713,126) | $ (2,702,512) | $ (4,020,362) | $ (3,477,532)
Residential Investment securities sold, carrying value | 6,900,000 | $ 11,600,000 | 20,500,000 | $ 21,000,000
Agency |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Unrealized gains (losses) on agency mortgage-backed securities | $ (2,000,000) |  | $ (2,400,000) |

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