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Borrowings and Subordinated Debt - Summary of Borrowings and Debentures (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Rate	4.62%	5.06%
Short-Term Debt, Other, Average Rate Paid	4.18%	0.00%
Other Short-Term Borrowings	$ 190,000	$ 0
Senior Notes	$ 0	$ 174,000
Senior Notes, Interest Rate	0.00%	5.25%
Total Borrowings	$ 2,005,022	$ 1,392,838
Acquisition Discount on Senior Notes	0	(1,024)
Borrowings (including $115,022 and $118,838 at fair value, respectively)	2,005,022	1,391,814
Credit-Link Notes
Debt Instrument [Line Items]
Credit-linked Notes	$ 115,022	$ 118,838
Credit-linked ,Variable interest, percentage rate	15.09%	15.29%
Federal Home Loan Bank of San Francisco | Secured Debt [Member]
Debt Instrument [Line Items]
Line of credit, current	$ 1,700,000	$ 1,100,000
Rate	3.96%	3.93%

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