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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Realized and Unrealized Gains on Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Total realized and unrealized (losses) gains on derivative financial instruments $ (135,083) $ 36,831 $ (39,606) $ 166,451
Gain on origination and sale of loans, net | Interest rate lock commitments        
Derivative Instruments, Gain (Loss) [Line Items]        
Total realized and unrealized (losses) gains on derivative financial instruments (73,871) 202,144 (387,835) 593,450
Gain on origination and sale of loans, net | Forward sales contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total realized and unrealized (losses) gains on derivative financial instruments (29,867) (181,681) 477,215 (530,186)
Gain on origination and sale of loans, net | Interest rate swap futures        
Derivative Instruments, Gain (Loss) [Line Items]        
Total realized and unrealized (losses) gains on derivative financial instruments (29,683) 534 (81,891) (5,739)
Gain on origination and sale of loans, net | Put options        
Derivative Instruments, Gain (Loss) [Line Items]        
Total realized and unrealized (losses) gains on derivative financial instruments 19,891 (10,475) 47,063 (16,404)
Change in fair value of servicing rights, net | Forward sales contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total realized and unrealized (losses) gains on derivative financial instruments (5,838) 28,290 (84,842) 106,315
Change in fair value of servicing rights, net | Interest rate swap futures        
Derivative Instruments, Gain (Loss) [Line Items]        
Total realized and unrealized (losses) gains on derivative financial instruments (14,033) (1,350) (6,855) 20,274
Change in fair value of servicing rights, net | Put options        
Derivative Instruments, Gain (Loss) [Line Items]        
Total realized and unrealized (losses) gains on derivative financial instruments $ (1,682) $ (631) $ (2,461) $ (1,259)