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Fair Value Measurement - Schedule of Rollforward of Level 3 Assets (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Other changes      
Loans (at fair value)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning balance 837,565 $ 623,763 $ 1,010,421 $ 252,477
Transfer of loans to consolidated securitization 0   0  
Reclassification of loans from HFS to HFI       0
Purchases of loans 516,635 375,181 1,174,602 1,514,822
Sale of loans (269,627) (232,302) (888,019) (866,984)
Purchase of loans for immediate resale 342,467 722,080 1,023,426 5,519,116
Immediate resale of loans (342,467) (722,080) (1,023,426) (5,519,116)
Repayments received (77,953) (46,447) (230,211) (131,760)
Changes in fair value recorded in earnings (34,577) (21,059) (95,909) (73,376)
Other changes 293 1,319 1,452 5,276
Fair value, ending balance 972,336 700,455 972,336 700,455
Loans Held-for- Sale        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning balance 689,851 605,319 882,810 142,685
Transfer of loans to consolidated securitization (209,968)   (209,968)  
Reclassification of loans from HFS to HFI       103,679
Purchases of loans 483,921 333,779 1,053,309 1,459,544
Sale of loans (269,627) (232,302) (888,019) (866,984)
Purchase of loans for immediate resale 342,467 722,080 1,023,426 5,519,116
Immediate resale of loans (342,467) (722,080) (1,023,426) (5,519,116)
Repayments received (40,894) (43,748) (149,697) (128,023)
Changes in fair value recorded in earnings (20,203) (16,499) (54,767) (68,329)
Other changes (764) 629 (1,352) 4,606
Fair value, ending balance 632,316 647,178 632,316 647,178
Loans Held-for-Investment        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning balance 147,714 18,444 127,611 109,792
Transfer of loans to consolidated securitization 0   0  
Reclassification of loans from HFS to HFI       (103,679)
Purchases of loans 32,714 41,402 121,293 55,278
Sale of loans 0 0 0 0
Purchase of loans for immediate resale 0 0 0 0
Immediate resale of loans 0 0 0 0
Repayments received (24,757) (2,699) (68,212) (3,737)
Changes in fair value recorded in earnings (13,235) (4,560) (40,003) (5,047)
Other changes 1,057 690 2,804 670
Fair value, ending balance 143,493 53,277 143,493 53,277
Loans Held in Consolidated Securitization        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning balance 0 0 0 0
Transfer of loans to consolidated securitization 209,968   209,968  
Reclassification of loans from HFS to HFI       0
Purchases of loans 0 0 0 0
Sale of loans 0 0 0 0
Purchase of loans for immediate resale 0 0 0 0
Immediate resale of loans 0 0 0 0
Repayments received (12,302) 0 (12,302) 0
Changes in fair value recorded in earnings (1,139) 0 (1,139) 0
Other changes 0 0 0 0
Fair value, ending balance $ 196,527 $ 0 $ 196,527 $ 0