Resale and Repurchase Agreements (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Total resale agreements, subject to master netting arrangements
Balance Sheet Offsetting [Line Items]
Securities Purchased under Agreements to Resell, Gross	$ 2,025,000	$ 2,025,000
Securities Purchased under Agreements to Resell, Liability	(200,000)	(400,000)
Securities purchased under agreements to resell	1,825,000	1,625,000
Securities Purchased under Agreements to Resell, Not Subject to Master Netting Arrangement	0	0
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities	(1,825,000)	(1,625,000)
Securities Purchased under Agreements to Resell, Amount Offset Against Collateral	0	0
Total repurchase agreements, subject to master netting arrangements
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Gross	2,500,146	3,379,582
Securities Sold under Agreements to Repurchase, Asset	(200,000)	(400,000)
Securities Sold under Agreements to Repurchase	2,300,146	2,979,582
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(2,300,146)	(2,979,582)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	$ 0	$ 0