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ACQUISITIONS - Schedule of Asset Acquisition (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 07, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022
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Asset Acquisition [Line Items] |  |  |  |  |  |  |
Unpaid principal balance | $ 18,733,455 |  |  | $ 16,456,728 |  |  |
Allowance for credit losses at acquisition | $ (257,522) | $ (251,749) |  | $ (166,680) | $ (161,293) | $ (157,218) | $ (148,617)
Real Estate Loan Portfolios | PCD |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Unpaid principal balance |  |  | $ 341,301 |  |  |  |
Non-credit discount |  |  | (100,686) |  |  |  |
Allowance for credit losses at acquisition |  |  | (70,097) |  |  |  |
Purchase price |  |  | $ 170,518 |  |  |  |

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