Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans at fair value	$ 7,338,135	$ 5,449,884
Investment securities at fair value, pledged	108,323	110,352
Total assets	10,672,311	9,619,391
Public and Private Warrants	7,147	7,833
Total liabilities	34,065	48,614
IRLCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	25,359	29,623
Derivative liability	5,443	2,933
FLSCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	8,691	3,396
Derivative liability	21,475	37,848
Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	3,191,803	4,026,136	$ 3,974,870	$ 4,453,261
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans at fair value	0	0
Investment securities at fair value, pledged	0	0
Total assets	0	0
Public and Private Warrants	3,081	3,078
Total liabilities	3,081	3,078
Level 1 | IRLCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Level 1 | FLSCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Level 1 | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans at fair value	7,338,135	5,449,884
Investment securities at fair value, pledged	108,323	110,352
Total assets	7,455,149	5,563,632
Public and Private Warrants	4,066	4,755
Total liabilities	25,541	42,603
Level 2 | IRLCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Level 2 | FLSCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	8,691	3,396
Derivative liability	21,475	37,848
Level 2 | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans at fair value	0	0
Investment securities at fair value, pledged	0	0
Total assets	3,217,162	4,055,759
Public and Private Warrants	0	0
Total liabilities	5,443	2,933
Level 3 | IRLCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	25,359	29,623
Derivative liability	5,443	2,933
Level 3 | FLSCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Level 3 | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	$ 3,191,803	$ 4,026,136