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Debt Securities Available for Sale - AFS debt securities in a continuous unrealized loss position (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value $ 8,534,918 $ 2,385,549
Less than 12 months Gross Unrealized Losses 14,549 27,848
12 months or more Fair Value 7,053,340 8,771,666
12 months or more Gross Unrealized Losses 1,046,683 1,246,136
Total Fair Value 15,588,258 11,157,215
Total Gross Unrealized Losses 1,061,232 1,273,984
US Treasury Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 8,477,646 2,309,894
Less than 12 months Gross Unrealized Losses 11,934 24,646
12 months or more Fair Value 2,097,347 3,638,092
12 months or more Gross Unrealized Losses 36,698 85,010
Total Fair Value 10,574,993 5,947,986
Total Gross Unrealized Losses 48,632 109,656
Collateralized Mortgage Obligations - Federal agencies    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 6,592 4,878
Less than 12 months Gross Unrealized Losses 21 27
12 months or more Fair Value 92,871 102,160
12 months or more Gross Unrealized Losses 7,997 9,861
Total Fair Value 99,463 107,038
Total Gross Unrealized Losses 8,018 9,888
Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 50,680 70,777
Less than 12 months Gross Unrealized Losses 2,594 3,175
12 months or more Fair Value 4,863,122 5,031,414
12 months or more Gross Unrealized Losses 1,001,988 1,151,265
Total Fair Value 4,913,802 5,102,191
Total Gross Unrealized Losses $ 1,004,582 $ 1,154,440