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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Realized and Unrealized Gains on Derivatives (Details) - USD ($)
$ in Thousands
 12 Months Ended
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)