Disclosures About Offsetting Assets and Liabilities - Financial Liabilities and Derivative Liabilities that are Subject to Offset (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities, Securities lending	$ (292,243)	$ (178,928)
Net amounts presented in the Statement of Financial Condition, Securities lending	(292,243)	(178,928)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities lending	28,404	74,488
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities lending	263,827	104,434
Securities lending, Net amount	(12)	(6)
Gross amounts of recognized liabilities, Securities purchased under agreements to resell	(684,561)	(580,170)
Net amounts presented in the Statement of Financial Condition, Securities purchased under agreements to resell	(684,561)	(580,170)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities purchased under agreements to resell	12,445	63,771
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities purchased under agreements to resell	672,116	516,399
Gross amounts of recognized liabilities	(1,067,865)	(869,923)
Net amounts presented in the Statement of Financial Condition	(1,067,865)	(869,923)
Gross amounts not offset in the Statement of Financial Position, Financial instruments	52,191	143,882
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged	953,924	651,559
Net amount	(61,750)	(74,482)
Interest Rate Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	(91,061)	(110,825)
Net amounts presented in the Statement of Financial Condition	(91,061)	(110,825)
Gross amounts not offset in the Statement of Financial Position, Financial instruments	11,342	5,623
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged	17,981	30,726
Offsetting liability interest rate contracts net	$ (61,738)	$ (74,476)