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FAIR VALUE - Assets and Liabilities on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Servicing Rights:        
Issuances and additions $ 0 $ 0 $ 0 $ 122,532
Servicing Rights, net        
Servicing Rights:        
Balance at beginning of period 1,616,854 1,566,463 1,615,510 1,985,718
Issuances and additions 69,163 62,039 188,789 176,529
Fallout 0 0 0 0
Transfers of IRLC to LHFS 0 0 0 0
Valuation changes in servicing rights, net (56,116) (94,023) (158,562) (132,457)
Sales (11,642) (8,466) (27,478) (503,777)
Balance at end of period 1,618,259 1,526,013 1,618,259 1,526,013
Servicing Rights, net | Level 3        
Servicing Rights:        
Unrealized gain (loss) relating to servicing rights still held (23,500) (62,800) 31,900 33,600
IRLCs, net        
Derivatives:        
Balance at beginning of period 54,364 49,747 25,552 47,940
Issuances and additions 127,272 149,859 374,608 340,279
Fallout (25,267) (29,560) (68,337) (70,218)
Transfers of IRLC to LHFS (108,416) (104,425) (283,870) (252,380)
Valuation changes in servicing rights, net 0 0 0 0
Sales 0 0 0 0
Balance at end of period $ 47,953 $ 65,621 $ 47,953 $ 65,621