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SECURITIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized gains (losses) on agency mortgage-backed securities | $ (994,127) | $ 1,712
Residential Investment securities sold, carrying value | 8,100,000 | 5,200,000
Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized gains (losses) on agency mortgage-backed securities | $ (674,000) | $ 386,700

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