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Debt Securities Available for Sale - AFS debt securities in a continuous unrealized loss position (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value $ 287,277 $ 7,907,905
Less than 12 months Gross Unrealized Losses 5,566 437,310
12 months or more Fair Value 12,455,131 7,929,428
12 months or more Gross Unrealized Losses 1,367,947 1,322,381
Total Fair Value 12,742,408 15,837,333
Total Gross Unrealized Losses 1,373,513 1,759,691
US Treasury Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 244,925 6,027,786
Less than 12 months Gross Unrealized Losses 5,126 288,582
12 months or more Fair Value 6,550,941 3,244,572
12 months or more Gross Unrealized Losses 257,662 209,696
Total Fair Value 6,795,866 9,272,358
Total Gross Unrealized Losses 262,788 498,278
Collateralized Mortgage Obligations - Federal agencies    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 5,234 139,845
Less than 12 months Gross Unrealized Losses 35 10,655
12 months or more Fair Value 124,930 22,661
12 months or more Gross Unrealized Losses 11,992 3,705
Total Fair Value 130,164 162,506
Total Gross Unrealized Losses 12,027 14,360
Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 37,118 1,740,214
Less than 12 months Gross Unrealized Losses 405 138,071
12 months or more Fair Value 5,779,260 4,662,195
12 months or more Gross Unrealized Losses 1,098,293 1,108,980
Total Fair Value 5,816,378 6,402,409
Total Gross Unrealized Losses $ 1,098,698 1,247,051
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