Debt Securities Available for Sale - AFS debt securities in a continuous unrealized loss position (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	$ 7,907,905	$ 15,393,537
Less than 12 months Gross Unrealized Losses	437,310	273,007
12 months or more Fair Value	7,929,428	596,135
12 months or more Gross Unrealized Losses	1,322,381	25,341
Total Fair Value	15,837,333	15,989,672
Total Gross Unrealized Losses	1,759,691	298,348
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	6,027,786	9,590,448
Less than 12 months Gross Unrealized Losses	288,582	102,059
12 months or more Fair Value	3,244,572	0
12 months or more Gross Unrealized Losses	209,696	0
Total Fair Value	9,272,358	9,590,448
Total Gross Unrealized Losses	498,278	102,059
Collateralized Mortgage Obligations - Federal agencies
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	139,845	35,533
Less than 12 months Gross Unrealized Losses	10,655	334
12 months or more Fair Value	22,661	1,084
12 months or more Gross Unrealized Losses	3,705	29
Total Fair Value	162,506	36,617
Total Gross Unrealized Losses	14,360	363
Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	1,740,214	5,767,556
Less than 12 months Gross Unrealized Losses	138,071	170,614
12 months or more Fair Value	4,662,195	595,051
12 months or more Gross Unrealized Losses	1,108,980	25,312
Total Fair Value	6,402,409	6,362,607
Total Gross Unrealized Losses	1,247,051	$ 195,926
Other
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	60
Less than 12 months Gross Unrealized Losses	2
12 months or more Fair Value	0
12 months or more Gross Unrealized Losses	0
Total Fair Value	60
Total Gross Unrealized Losses	$ 2