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Disclosures About Offsetting Assets and Liabilities - Financial Liabilities and Derivative Liabilities that are Subject to Offset (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Offsetting Liabilities [Line Items] |  |
Gross amounts of recognized liabilities, Securities lending | $ (320,161) | $ (178,928)
Net amounts presented in the Statement of Financial Condition, Securities lending | (320,161) | (178,928)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities lending | 82,786 | 74,488
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities lending | 237,373 | 104,434
Securities lending, Net amount | (2) | (6)
Gross amounts of recognized liabilities, Securities purchased under agreements to resell | (747,301) | (580,170)
Net amounts presented in the Statement of Financial Condition, Securities purchased under agreements to resell | (747,301) | (580,170)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities purchased under agreements to resell | 5,450 | 63,771
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities purchased under agreements to resell | 741,851 | 516,399
Gross amounts of recognized liabilities | (1,143,587) | (869,923)
Net amounts presented in the Statement of Financial Condition | (1,143,587) | (869,923)
Gross amounts not offset in the Statement of Financial Position, Financial instruments | 104,194 | 143,882
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged | 1,018,514 | 651,559
Net amount | (20,879) | (74,482)
Interest Rate Contracts [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts of recognized liabilities | (76,125) | (110,825)
Net amounts presented in the Statement of Financial Condition | (76,125) | (110,825)
Gross amounts not offset in the Statement of Financial Position, Financial instruments | 15,958 | 5,623
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged | 39,290 | 30,726
Offsetting liability interest rate contracts net | $ (20,877) | $ (74,476)

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