Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans at fair value	$ 8,040,310		$ 9,516,537
Investment securities at fair value, pledged	101,627		103,013
Total assets	11,646,488		13,689,395
Public and Private Warrants	749		2,743
Total liabilities	77,432		38,708
IRLCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	54,747		6,729
Derivative liability	1,562		33,685
FLSCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	4,609		93,235
Derivative liability	75,121		2,280
Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	3,445,195	$ 3,321,457	3,969,881	$ 2,650,090	$ 3,191,803	$ 4,026,136
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	744		2,178
Total liabilities	744		2,178
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	8,040,310		9,516,537
Investment securities at fair value, pledged	101,627		103,013
Total assets	8,146,546		9,712,785
Public and Private Warrants	5		565
Total liabilities	75,126		2,845
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	4,609		93,235
Derivative liability	75,121		2,280
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	3,499,942		3,976,610
Public and Private Warrants	0		0
Total liabilities	1,562		33,685
Level 3 | IRLCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	54,747		6,729
Derivative liability	1,562		33,685
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	$ 3,445,195		$ 3,969,881