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Debt Securities Available for Sale - AFS debt securities in a continuous unrealized loss position (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value $ 4,266,380 $ 2,385,549
Less than 12 months Gross Unrealized Losses 9,530 27,848
12 months or more Fair Value 6,542,045 8,771,666
12 months or more Gross Unrealized Losses 950,966 1,246,136
Total Fair Value 10,808,425 11,157,215
Total Gross Unrealized Losses 960,496 1,273,984
US Treasury Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 4,241,874 2,309,894
Less than 12 months Gross Unrealized Losses 9,041 24,646
12 months or more Fair Value 1,656,231 3,638,092
12 months or more Gross Unrealized Losses 23,144 85,010
Total Fair Value 5,898,105 5,947,986
Total Gross Unrealized Losses 32,185 109,656
Collateralized Mortgage Obligations - Federal agencies    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 6,506 4,878
Less than 12 months Gross Unrealized Losses 9 27
12 months or more Fair Value 87,499 102,160
12 months or more Gross Unrealized Losses 7,215 9,861
Total Fair Value 94,005 107,038
Total Gross Unrealized Losses 7,224 9,888
Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 18,000 70,777
Less than 12 months Gross Unrealized Losses 480 3,175
12 months or more Fair Value 4,798,315 5,031,414
12 months or more Gross Unrealized Losses 920,607 1,151,265
Total Fair Value 4,816,315 5,102,191
Total Gross Unrealized Losses $ 921,087 $ 1,154,440