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Borrowings and Financing Activities - Schedule of Debt (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total other borrowings		$ 60,401	$ 45,865
Senior Notes
Debt Instrument [Line Items]
Long-term debt		$ 1,067,251	1,065,337
Senior Notes | Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate on senior notes		4.875%
Long-term debt		$ 448,292	447,461
Senior Notes | Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate on senior notes		6.20%
Long-term debt		$ 618,959	617,876
FHLB Advances
Debt Instrument [Line Items]
FHLB advances due 2025, average interest rate	[1]	4.49%
FHLB advances due 2026, average interest rate	[1]	4.414%
FHLB advances due 2027, average interest rate	[1]	2.562%
2025		$ 47,244	36,143
2026		5,270	1,835
2027		$ 7,887	$ 7,887
[1] As of September 30, 2025. See “FHLB Advances” below for more information.

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