Investment In Securities - Weighted Average Lives of Trading Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value
Less than 1 year	$ 99,973	$ 0
Greater than or equal to 1 year and less than 3 years	5,323	649,425
Greater than or equal to 3 years and less than 5 years	472,774	1,522,509
Greater than or equal to 5 years	2,639,439	1,035,486
Total	3,217,509	3,207,420
Amortized Cost
Less than 1 year	99,978	0
Greater than or equal to 1 year and less than 3 years	5,365	650,328
Greater than or equal to 3 years and less than 5 years	475,600	1,506,035
Greater than or equal to 5 years	2,690,243	1,030,366
Total	$ 3,271,186	$ 3,186,729