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FAIR VALUE - Assets and Liabilities on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Interest rate lock commitments      
Derivatives:      
Balance at beginning of period $ 23,590 $ 180,620 $ 647,045
Issuances and additions 387,498 380,443 2,169,847
Settlements (275,451) (377,071) (1,969,541)
Other factors (87,697) (160,402) (666,731)
Sales 0 0 0
Balance at end of period 47,940 23,590 180,620
Servicing Rights, net      
Derivatives:      
Issuances and additions 277,387 647,716 1,610,596
Other factors   0 0
Servicing Rights:      
Balance at beginning of period 2,025,136 1,999,402 1,124,302
Settlements 0 0 0
Other factors 0    
Sales (180,687) (765,151) (383,729)
Balance at end of period 1,985,718 2,025,136 1,999,402
Servicing Rights, net | Level 3      
Derivatives:      
Change in fair value of servicing rights, net (136,118) 143,169 (351,767)
Servicing Rights:      
Unrealized gain (loss) relating to servicing rights still held $ (61,100) $ 710,300 $ 1,300,000