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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
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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

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