Debt Securities Available for Sale - AFS debt securities in a continuous unrealized loss position (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale
Less than 12 months Fair Value	$ 18,170,576	$ 15,393,537
Less than 12 months Gross Unrealized Losses	814,491	273,007
12 months or more Fair Value	5,167,612	596,135
12 months or more Gross Unrealized Losses	521,729	25,341
Total Fair Value	23,338,188	15,989,672
Total Gross Unrealized Losses	1,336,220	298,348
US Treasury Securities
Debt Securities, Available-for-sale
Less than 12 months Fair Value	15,249,412	9,590,448
Less than 12 months Gross Unrealized Losses	681,815	102,059
12 months or more Fair Value	553,050	0
12 months or more Gross Unrealized Losses	31,807	0
Total Fair Value	15,802,462	9,590,448
Total Gross Unrealized Losses	713,622	102,059
Collateralized Mortgage Obligations - Federal agencies
Debt Securities, Available-for-sale
Less than 12 months Fair Value	157,384	35,533
Less than 12 months Gross Unrealized Losses	5,854	334
12 months or more Fair Value	997	1,084
12 months or more Gross Unrealized Losses	92	29
Total Fair Value	158,381	36,617
Total Gross Unrealized Losses	5,946	363
Mortgage Backed Securities
Debt Securities, Available-for-sale
Less than 12 months Fair Value	2,763,780	5,767,556
Less than 12 months Gross Unrealized Losses	126,822	170,614
12 months or more Fair Value	4,613,565	595,051
12 months or more Gross Unrealized Losses	489,830	25,312
Total Fair Value	7,377,345	6,362,607
Total Gross Unrealized Losses	$ 616,652	$ 195,926

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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