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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Realized and Unrealized Gains on Derivatives (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total realized and unrealized losses on derivative financial instruments | $ (27,718) | $ 757,185 | $ (44,064)
Derivative assets, at fair value | 93,574 | 39,411 |
Derivative liabilities, at fair value | $ 84,962 | $ 67,492 |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues, Net of Interest Expense | Revenues, Net of Interest Expense | Revenues, Net of Interest Expense
Interest rate lock commitments |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total realized and unrealized losses on derivative financial instruments | $ 24,350 | $ (157,030) | $ (466,425)
Notional, assets | 2,007,175 | 1,591,807 |
Derivative assets, at fair value | 49,112 | 29,374 |
Notional, liabilities | 163,161 | 622,706 |
Derivative liabilities, at fair value | 1,172 | 5,784 |
Forward sale contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional, assets | 449,419 | 309,809 |
Derivative assets, at fair value | 16,610 | 6,676 |
Notional, liabilities | 2,234,930 | 2,963,685 |
Derivative liabilities, at fair value | 83,728 | 43,482 |
Forward sale contracts | Gain on origination and sale of loans, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total realized and unrealized losses on derivative financial instruments | 6,958 | 1,195,708 | 540,811
Forward sale contracts | Change in fair value of servicing rights, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total realized and unrealized losses on derivative financial instruments | (13,763) | (114,244) | (89,127)
Put options on treasuries |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional, assets | 0 | 0 |
Derivative assets, at fair value | 0 | 0 |
Notional, liabilities | 9,730 | 8,050 |
Derivative liabilities, at fair value | 62 | 10,831 |
Interest rate swap futures |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional, assets | 3,240 | 0 |
Derivative assets, at fair value | 26,476 | 0 |
Notional, liabilities | 0 | 211 |
Derivative liabilities, at fair value | 0 | 7,395 |
Interest rate swap futures | Gain on origination and sale of loans, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total realized and unrealized losses on derivative financial instruments | (31,328) | (81,259) | (111,300)
Interest rate swap futures | Change in fair value of servicing rights, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total realized and unrealized losses on derivative financial instruments | (22,572) | (201,259) | 9,071
MBS put options |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional, assets | 200,000 | 400,000 |
Derivative assets, at fair value | 1,376 | 3,361 |
Notional, liabilities | 0 | 0 |
Derivative liabilities, at fair value | 0 | 0 |
Put options | Gain on origination and sale of loans, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total realized and unrealized losses on derivative financial instruments | 20,221 | 123,075 | 75,728
Put options | Change in fair value of servicing rights, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total realized and unrealized losses on derivative financial instruments | $ (11,584) | $ (7,806) | $ (2,822)

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