Disclosures About Offsetting Assets and Liabilities - Financial Liabilities and Derivative Liabilities that are Subject to Offset (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities, Securities lending	$ (110,175)	$ (68,105)
Net amounts presented in the Statement of Financial Condition, Securities lending	(110,175)	(68,105)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities lending	15,723	46,647
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities lending	94,452	21,448
Securities lending, Net amount	0	(10)
Gross amounts of recognized liabilities, Securities purchased under agreements to resell	(318,321)	(212,011)
Net amounts presented in the Statement of Financial Condition, Securities purchased under agreements to resell	(318,321)	(212,011)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities purchased under agreements to resell	9,243	12,028
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities purchased under agreements to resell	309,078	199,983
Gross amounts of recognized liabilities	(564,595)	(422,144)
Net amounts presented in the Statement of Financial Condition	(564,595)	(422,144)
Gross amounts not offset in the Statement of Financial Position, Financial instruments	28,055	60,634
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged	410,850	247,281
Net amount	(125,690)	(114,229)
Interest Rate Contract [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	(136,099)	(142,028)
Net amounts presented in the Statement of Financial Condition	(136,099)	(142,028)
Gross amounts not offset in the Statement of Financial Position, Financial instruments	3,089	1,959
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged	7,320	25,850
Offsetting liability interest rate contracts net	$ (125,690)	$ (114,219)