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FAIR VALUE MEASUREMENTS - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |  |  |
Mortgage-backed securities | [1] | $ 59,042,734 |  | $ 63,655,674 | [2] |  |  |
Loans |  |  |  |  |  |  |  |
Mortgage servicing rights |  | 1,421,420 | $ 1,108,937 | 544,562 |  | $ 202,616 | $ 113,080 | $ 100,895
Derivative assets |  |  |  |  |  |  |  |
Derivative assets |  | 748,432 |  | 170,370 | [2] |  |  |
Liabilities |  |  |  |  |  |  |  |
Participations issued |  | 696,944 |  | 1,049,066 | [2] |  |  |
Derivative liabilities |  |  |  |  |  |  |  |
Interest rate swaps |  | 272,055 |  | 747,036 |  |  |  |
Residential Mortgage Loans |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  |
Residential mortgage loans |  | 9,905,790 |  | 7,768,507 |  |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | 55,593,336 |  | 60,525,605 |  |  |  |
Credit risk transfer securities |  | 965,714 |  | 936,228 |  |  |  |
Loans |  |  |  |  |  |  |  |
Mortgage servicing rights |  | 1,421,420 |  | 544,562 |  |  |  |
Interests in MSR |  | 83,622 |  | 69,316 |  |  |  |
Assets transferred or pledged to securitization vehicles |  |  |  | 6,086,308 |  |  |  |
Derivative assets |  |  |  |  |  |  |  |
Other derivatives |  | 739,024 |  | 170,370 |  |  |  |
Total assets |  | 71,660,588 |  | 72,799,282 |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Debt issued by securitization vehicles |  | 7,502,483 |  | 5,155,633 |  |  |  |
Participations issued |  | 696,944 |  | 1,049,066 |  |  |  |
Derivative liabilities |  |  |  |  |  |  |  |
Interest rate swaps |  | 272,055 |  | 747,036 |  |  |  |
Other derivatives |  | 107,653 |  | 134,501 |  |  |  |
Total liabilities |  | 8,579,135 |  | 7,086,236 |  |  |  |
Fair Value, Measurements, Recurring | Asset Transferred or Pledged |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  |
Assets transferred or pledged to securitization vehicles |  | 8,877,247 |  |  |  |  |  |
Fair Value, Measurements, Recurring | Non-Agency Mortgage-Backed Securities |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Mortgage-backed securities |  | 2,026,658 |  | 1,663,336 |  |  |  |
Fair Value, Measurements, Recurring | Commercial Mortgage-Backed Securities |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Mortgage-backed securities |  | 457,026 |  | 530,505 |  |  |  |
Fair Value, Measurements, Recurring | Residential Mortgage Loans |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  |
Residential mortgage loans |  | 1,486,811 |  | 2,272,072 |  |  |  |
Residential mortgage loan warehouse facility |  | 322 |  | 980 |  |  |  |
Fair Value, Measurements, Recurring | Interest rate swaps |  |  |  |  |  |  |  |
Derivative assets |  |  |  |  |  |  |  |
Derivative assets |  | 9,408 |  |  |  |  |  |
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 |  |  |  |
Interests in MSR |  | 0 |  | 0 |  |  |  |
Derivative assets |  |  |  |  |  |  |  |
Other derivatives |  | 341,430 |  | 9,028 |  |  |  |
Total assets |  | 341,430 |  | 9,028 |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Debt issued by securitization vehicles |  | 0 |  | 0 |  |  |  |
Participations issued |  | 0 |  | 0 |  |  |  |
Derivative liabilities |  |  |  |  |  |  |  |
Interest rate swaps |  | 0 |  | 0 |  |  |  |
Other derivatives |  | 3,020 |  | 129,134 |  |  |  |
Total liabilities |  | 3,020 |  | 129,134 |  |  |  |
Fair Value, Measurements, Recurring | Level 1 | Asset Transferred or Pledged |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  |
Assets transferred or pledged to securitization vehicles |  | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 1 | Non-Agency Mortgage-Backed Securities |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Mortgage-backed securities |  | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 1 | Commercial Mortgage-Backed Securities |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Mortgage-backed securities |  | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 1 | Residential Mortgage Loans |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  |
Residential mortgage loans |  | 0 |  | 0 |  |  |  |
Residential mortgage loan warehouse facility |  | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 1 | Interest rate swaps |  |  |  |  |  |  |  |
Derivative assets |  |  |  |  |  |  |  |
Derivative assets |  | 0 |  |  |  |  |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | 55,593,336 |  | 60,525,605 |  |  |  |
Credit risk transfer securities |  | 965,714 |  | 936,228 |  |  |  |
Loans |  |  |  |  |  |  |  |
Mortgage servicing rights |  | 0 |  | 0 |  |  |  |
Interests in MSR |  | 0 |  | 0 |  |  |  |
Assets transferred or pledged to securitization vehicles |  |  |  | 6,086,308 |  |  |  |
Derivative assets |  |  |  |  |  |  |  |
Other derivatives |  | 397,594 |  | 161,342 |  |  |  |
Total assets |  | 69,814,116 |  | 72,176,376 |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Debt issued by securitization vehicles |  | 7,502,483 |  | 5,155,633 |  |  |  |
Participations issued |  | 696,944 |  | 1,049,066 |  |  |  |
Derivative liabilities |  |  |  |  |  |  |  |
Interest rate swaps |  | 272,055 |  | 747,036 |  |  |  |
Other derivatives |  | 104,633 |  | 5,367 |  |  |  |
Total liabilities |  | 8,576,115 |  | 6,957,102 |  |  |  |
Fair Value, Measurements, Recurring | Level 2 | Asset Transferred or Pledged |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  |
Assets transferred or pledged to securitization vehicles |  | 8,877,247 |  |  |  |  |  |
Fair Value, Measurements, Recurring | Level 2 | Non-Agency Mortgage-Backed Securities |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Mortgage-backed securities |  | 2,026,658 |  | 1,663,336 |  |  |  |
Fair Value, Measurements, Recurring | Level 2 | Commercial Mortgage-Backed Securities |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Mortgage-backed securities |  | 457,026 |  | 530,505 |  |  |  |
Fair Value, Measurements, Recurring | Level 2 | Residential Mortgage Loans |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  |
Residential mortgage loans |  | 1,486,811 |  | 2,272,072 |  |  |  |
Residential mortgage loan warehouse facility |  | 322 |  | 980 |  |  |  |
Fair Value, Measurements, Recurring | Level 2 | Interest rate swaps |  |  |  |  |  |  |  |
Derivative assets |  |  |  |  |  |  |  |
Derivative assets |  | 9,408 |  |  |  |  |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | 0 |  | 0 |  |  |  |
Credit risk transfer securities |  | 0 |  | 0 |  |  |  |
Loans |  |  |  |  |  |  |  |
Mortgage servicing rights |  | 1,421,420 |  | 544,562 |  |  |  |
Interests in MSR |  | 83,622 |  | 69,316 |  |  |  |
Assets transferred or pledged to securitization vehicles |  |  |  | 0 |  |  |  |
Derivative assets |  |  |  |  |  |  |  |
Other derivatives |  | 0 |  | 0 |  |  |  |
Total assets |  | 1,505,042 |  | 613,878 |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Debt issued by securitization vehicles |  | 0 |  | 0 |  |  |  |
Participations issued |  | 0 |  | 0 |  |  |  |
Derivative liabilities |  |  |  |  |  |  |  |
Interest rate swaps |  | 0 |  | 0 |  |  |  |
Other derivatives |  | 0 |  | 0 |  |  |  |
Total liabilities |  | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 3 | Asset Transferred or Pledged |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  |
Assets transferred or pledged to securitization vehicles |  | 0 |  |  |  |  |  |
Fair Value, Measurements, Recurring | Level 3 | Non-Agency Mortgage-Backed Securities |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Mortgage-backed securities |  | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 3 | Commercial Mortgage-Backed Securities |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Mortgage-backed securities |  | 0 |  | 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 3 | Residential Mortgage Loans |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  |
Residential mortgage loans |  | 0 |  | 0 |  |  |  |
Residential mortgage loan warehouse facility |  | 0 |  | $ 0 |  |  |  |
Fair Value, Measurements, Recurring | Level 3 | Interest rate swaps |  |  |  |  |  |  |  |
Derivative assets |  |  |  |  |  |  |  |
Derivative assets |  | $ 0 |  |  |  |  |  |
[1] | (3)Excludes $30.1 million and $44.2 million at June 30, 2022 and December 31, 2021, respectively, of Agency mortgage-backed securities and $971.9 million and $350.4 million at June 30, 2022 and December 31, 2021, 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, 2021.

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