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FAIR VALUE MEASUREMENTS - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Loans |  |  |  |  |  |  |
Mortgage servicing rights | $ 3,281,190 | $ 3,272,902 | $ 2,909,134 |  | $ 2,785,614 | $ 2,651,279 | $ 2,122,196
Derivative assets |  |  |  |  |  |  |
Interest rate swaps | 149,690 |  | 225,351 | [1] |  |  |
Liabilities |  |  |  |  |  |  |
Participations issued | 1,556,900 |  | 1,154,816 | [1] |  |  |
U.S. Treasury securities sold, not yet purchased | 2,528,167 |  | 2,470,629 | [1] |  |  |
Derivative liabilities |  |  |  |  |  |  |
Interest rate swaps | 23,547 |  | 7,212 |  |  |  |
Residential mortgage loans |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |
Residential mortgage loans | 30,744,062 |  | 25,520,090 |  |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Agency mortgage-backed securities | 71,756,638 |  | 67,434,068 |  |  |  |
Credit risk transfer securities | 414,047 |  | 754,915 |  |  |  |
Loans |  |  |  |  |  |  |
Mortgage servicing rights | 3,281,190 |  | 2,909,134 |  |  |  |
Derivative assets |  |  |  |  |  |  |
Other derivatives | 144,687 |  | 204,125 |  |  |  |
Total assets | 107,675,568 |  | 98,411,022 |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt issued by securitization vehicles | 24,107,249 |  | 19,540,678 |  |  |  |
Participations issued | 1,556,900 |  | 1,154,816 |  |  |  |
U.S. Treasury securities sold, not yet purchased | 2,528,167 |  | 2,470,629 |  |  |  |
Derivative liabilities |  |  |  |  |  |  |
Interest rate swaps | 23,547 |  | 7,212 |  |  |  |
Other derivatives | 402,446 |  | 52,374 |  |  |  |
Total liabilities | 28,618,309 |  | 23,225,709 |  |  |  |
Fair Value, Measurements, Recurring | Assets transferred or pledged to securitization vehicles |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |
Assets transferred or pledged to securitization vehicles | 27,021,790 |  | 21,973,188 |  |  |  |
Fair Value, Measurements, Recurring | Non-Agency mortgage-backed securities |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Non-Agency mortgage-backed securities | 1,329,941 |  | 1,493,186 |  |  |  |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Non-Agency mortgage-backed securities |  |  | 74,278 |  |  |  |
Fair Value, Measurements, Recurring | Residential mortgage loans |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |
Residential mortgage loans | 3,722,272 |  | 3,546,902 |  |  |  |
Fair Value, Measurements, Recurring | Interest rate swaps |  |  |  |  |  |  |
Derivative assets |  |  |  |  |  |  |
Interest rate swaps | 5,003 |  | 21,226 |  |  |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Agency mortgage-backed securities | 0 |  | 0 |  |  |  |
Credit risk transfer securities | 0 |  | 0 |  |  |  |
Loans |  |  |  |  |  |  |
Mortgage servicing rights | 0 |  | 0 |  |  |  |
Derivative assets |  |  |  |  |  |  |
Other derivatives | 34,258 |  | 190,980 |  |  |  |
Total assets | 34,258 |  | 190,980 |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt issued by securitization vehicles | 0 |  | 0 |  |  |  |
Participations issued | 0 |  | 0 |  |  |  |
U.S. Treasury securities sold, not yet purchased | 2,528,167 |  | 2,470,629 |  |  |  |
Derivative liabilities |  |  |  |  |  |  |
Interest rate swaps | 0 |  | 0 |  |  |  |
Other derivatives | 401,113 |  | 16,650 |  |  |  |
Total liabilities | 2,929,280 |  | 2,487,279 |  |  |  |
Fair Value, Measurements, Recurring | Level 1 | Assets transferred or pledged to securitization vehicles |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |
Assets transferred or pledged to securitization vehicles | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 1 | Non-Agency mortgage-backed securities |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Non-Agency mortgage-backed securities | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 1 | Commercial mortgage-backed securities |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Non-Agency mortgage-backed securities |  |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 1 | Residential mortgage loans |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |
Residential mortgage loans | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 1 | Interest rate swaps |  |  |  |  |  |  |
Derivative assets |  |  |  |  |  |  |
Interest rate swaps | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Agency mortgage-backed securities | 71,756,638 |  | 67,434,068 |  |  |  |
Credit risk transfer securities | 414,047 |  | 754,915 |  |  |  |
Loans |  |  |  |  |  |  |
Mortgage servicing rights | 0 |  | 0 |  |  |  |
Derivative assets |  |  |  |  |  |  |
Other derivatives | 110,429 |  | 13,145 |  |  |  |
Total assets | 104,360,120 |  | 95,310,908 |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt issued by securitization vehicles | 24,107,249 |  | 19,540,678 |  |  |  |
Participations issued | 1,556,900 |  | 1,154,816 |  |  |  |
U.S. Treasury securities sold, not yet purchased | 0 |  | 0 |  |  |  |
Derivative liabilities |  |  |  |  |  |  |
Interest rate swaps | 23,547 |  | 7,212 |  |  |  |
Other derivatives | 1,333 |  | 35,724 |  |  |  |
Total liabilities | 25,689,029 |  | 20,738,430 |  |  |  |
Fair Value, Measurements, Recurring | Level 2 | Assets transferred or pledged to securitization vehicles |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |
Assets transferred or pledged to securitization vehicles | 27,021,790 |  | 21,973,188 |  |  |  |
Fair Value, Measurements, Recurring | Level 2 | Non-Agency mortgage-backed securities |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Non-Agency mortgage-backed securities | 1,329,941 |  | 1,493,186 |  |  |  |
Fair Value, Measurements, Recurring | Level 2 | Commercial mortgage-backed securities |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Non-Agency mortgage-backed securities |  |  | 74,278 |  |  |  |
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage loans |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |
Residential mortgage loans | 3,722,272 |  | 3,546,902 |  |  |  |
Fair Value, Measurements, Recurring | Level 2 | Interest rate swaps |  |  |  |  |  |  |
Derivative assets |  |  |  |  |  |  |
Interest rate swaps | 5,003 |  | 21,226 |  |  |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Agency mortgage-backed securities | 0 |  | 0 |  |  |  |
Credit risk transfer securities | 0 |  | 0 |  |  |  |
Loans |  |  |  |  |  |  |
Mortgage servicing rights | 3,281,190 |  | 2,909,134 |  |  |  |
Derivative assets |  |  |  |  |  |  |
Other derivatives | 0 |  | 0 |  |  |  |
Total assets | 3,281,190 |  | 2,909,134 |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt issued by securitization vehicles | 0 |  | 0 |  |  |  |
Participations issued | 0 |  | 0 |  |  |  |
U.S. Treasury securities sold, not yet purchased | 0 |  | 0 |  |  |  |
Derivative liabilities |  |  |  |  |  |  |
Interest rate swaps | 0 |  | 0 |  |  |  |
Other derivatives | 0 |  | 0 |  |  |  |
Total liabilities | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 3 | Assets transferred or pledged to securitization vehicles |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |
Assets transferred or pledged to securitization vehicles | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 3 | Non-Agency mortgage-backed securities |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Non-Agency mortgage-backed securities | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 3 | Commercial mortgage-backed securities |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Non-Agency mortgage-backed securities |  |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage loans |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |
Residential mortgage loans | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 3 | Interest rate swaps |  |  |  |  |  |  |
Derivative assets |  |  |  |  |  |  |
Interest rate swaps | $ 0 |  | $ 0 |  |  |  |
[1] | (1)Derived from the audited consolidated financial statements at December 31, 2024.

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