Borrowings and Financing Activities - Schedule of Debt (Details) - USD ($) $ in Thousands		Jun. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total secured borrowings		$ 762,933	$ 538,294
Senior Notes
Debt Instrument [Line Items]
Long-term debt		$ 1,066,603	1,065,337
Senior Notes | Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate on senior notes		4.875%
Long-term debt		$ 448,011	447,461
Senior Notes | Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate on senior notes		6.20%
Long-term debt		$ 618,592	617,876
FHLB Advances
Debt Instrument [Line Items]
FHLB advances due 2025, average interest rate	[1]	4.663%
FHLB advances due 2026, average interest rate	[1]	4.465%
FHLB advances due 2027, average interest rate	[1]	2.562%
2025		$ 87,528	36,143
2026		3,270	1,835
2027		7,887	7,887
Total FHLB advances		98,685	45,865
Mortgage Loan Financing Facilities
Debt Instrument [Line Items]
Long-term debt		$ 664,248	$ 492,429
Mortgage financing facilities, average interest rate	[1]	6.028%

[1] As of June 30, 2025. See “Mortgage Loan Financing Facilities” and “FHLB Advances” below for more information.