Disclosures About Offsetting Assets and Liabilities - Financial Liabilities and Derivative Liabilities that are Subject to Offset (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities, Securities lending	$ (230,321)	$ (149,219)
Net amounts presented in the Statement of Financial Condition, Securities lending	(230,321)	(149,219)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities lending	34,712	40,259
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities lending	177,035	108,955
Securities lending, Net amount	(18,574)	(5)
Gross amounts of recognized liabilities, Securities purchased under agreements to resell	(350,206)	(385,528)
Net amounts presented in the Statement of Financial Condition, Securities purchased under agreements to resell	(350,206)	(385,528)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities purchased under agreements to resell	71,980	52,413
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities purchased under agreements to resell	278,226	333,115
Gross amounts of recognized liabilities	(682,774)	(586,894)
Net amounts presented in the Statement of Financial Condition	(682,774)	(586,894)
Gross amounts not offset in the Statement of Financial Position, Financial instruments	111,647	117,821
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged	494,732	469,068
Net amount	(76,395)	(5)
Interest Rate Contract [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	(102,247)	(52,147)
Net amounts presented in the Statement of Financial Condition	(102,247)	(52,147)
Gross amounts not offset in the Statement of Financial Position, Financial instruments	4,955	25,149
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged	$ 39,471	$ 26,998