Borrowings and Financing Activities - Schedule of Debt (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total secured borrowings		$ 272,667	$ 538,294
Senior Notes
Debt Instrument [Line Items]
Long-term debt		$ 1,065,965	1,065,337
Senior Notes | Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate on senior notes		4.875%
Long-term debt		$ 447,734	447,461
Senior Notes | Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate on senior notes		6.20%
Long-term debt		$ 618,231	617,876
FHLB Advances
Debt Instrument [Line Items]
FHLB advances due 2025, average interest rate	[1]	4.604%
FHLB advances due 2026, average interest rate	[1]	4.469%
FHLB advances due 2027, average interest rate	[1]	2.562%
2025		$ 22,400	36,143
2026		1,835	1,835
2027		7,887	7,887
Total FHLB advances		32,122	45,865
Mortgage Loan Financing Facilities
Debt Instrument [Line Items]
Long-term debt		$ 240,545	$ 492,429
Mortgage financing facilities, average interest rate	[1]	5.963%

[1] As of March 31, 2025. See “Mortgage Loan Financing Facilities” and “FHLB Advances” below for more information.