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Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized cost |  |
Amortized Cost | $ 21,619,857 | $ 19,517,895
Gross unrealized gains |  |
Gross unrealized gains | 27,062 | 1,992
Gross unrealized loss |  |
Gross unrealized losses | 960,496 | 1,273,984
Fair Value |  |
Debt securities available-for-sale | $ 20,686,423 | $ 18,245,903
Weighted average yield |  |
Weighted Average Yield | 3.18% | 2.78%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 10,182,136 | $ 10,555,397
Amortized cost - After 1 to 5 years | 5,531,033 | 2,547,936
Amortized Cost | 15,713,169 | 13,103,333
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 2,162 | 1,282
Gross unrealized gain - After 1 to 5 years | 23,619 | 151
Gross unrealized gains | 25,781 | 1,433
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 8,399 | 46,275
Gross unrealized losses - After 1 to 5 years | 23,786 | 63,381
Gross unrealized losses | 32,185 | 109,656
Fair Value |  |
Fair value - Within 1 year | 10,175,899 | 10,510,404
Fair value - After 1 to 5 years | 5,530,866 | 2,484,706
Debt securities available-for-sale | $ 15,706,765 | $ 12,995,110
Weighted average yield |  |
Weighted average yield - Within 1 year | 3.68% | 3.33%
Weighted average yield - After 1 to 5 years | 3.73% | 3.07%
Weighted Average Yield | 3.70% | 3.28%
Collateralized Mortgage Obligations - Federal agencies |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 6,213 | $ 10,538
Amortized cost - After 5 to 10 years | 12,050 | 15,334
Amortized cost - After 10 years | 93,542 | 104,168
Amortized Cost | 111,805 | 130,040
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 0 | 0
Gross unrealized gain - After 5 to 10 years | 0 | 0
Gross unrealized gain - After 10 years | 119 | 132
Gross unrealized gains | 119 | 132
Gross unrealized loss |  |
Gross unrealized losses - After 1 to 5 years | 135 | 345
Gross unrealized losses - After 5 to 10 years | 549 | 904
Gross unrealized losses - After 10 years | 6,540 | 8,639
Gross unrealized losses | 7,224 | 9,888
Fair Value |  |
Fair value - After 1 to 5 years | 6,078 | 10,193
Fair value - After 5 to 10 years | 11,501 | 14,430
Fair value - After 10 years | 87,121 | 95,661
Debt securities available-for-sale | $ 104,700 | $ 120,284
Weighted average yield |  |
Weighted average yield - After 1 to 5 years | 1.52% | 1.53%
Weighted average yield - After 5 to 10 years | 2.51% | 2.24%
Weighted average yield - After 10 years | 2.92% | 2.76%
Weighted Average Yield | 2.80% | 2.60%
Mortgge Backed Securities - Federal agencies |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 15,380 | $ 776
Amortized cost - After 1 to 5 years | 82,670 | 79,542
Amortized cost - After 5 to 10 years | 836,304 | 733,506
Amortized cost - After 10 years | 4,859,779 | 5,468,448
Amortized Cost | 5,794,133 | 6,282,272
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 0 | 0
Gross unrealized gain - After 1 to 5 years | 8 | 8
Gross unrealized gain - After 5 to 10 years | 247 | 82
Gross unrealized gain - After 10 years | 907 | 337
Gross unrealized gains | 1,162 | 427
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 78 | 5
Gross unrealized losses - After 1 to 5 years | 2,102 | 2,700
Gross unrealized losses - After 5 to 10 years | 48,922 | 45,078
Gross unrealized losses - After 10 years | 869,985 | 1,106,657
Gross unrealized losses | 921,087 | 1,154,440
Fair Value |  |
Fair value - Within 1 year | 15,302 | 771
Fair value - After 1 to 5 years | 80,576 | 76,850
Fair value - After 5 to 10 years | 787,629 | 688,510
Fair value - After 10 years | 3,990,701 | 4,362,128
Debt securities available-for-sale | $ 4,874,208 | $ 5,128,259
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.23% | 1.65%
Weighted average yield - After 1 to 5 years | 2.30% | 2.35%
Weighted average yield - After 5 to 10 years | 2.10% | 2.37%
Weighted average yield - After 10 years | 1.70% | 1.67%
Weighted Average Yield | 1.77% | 1.75%
Other |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 500 | $ 500
Amortized cost - After 1 to 5 years | 250 | 1,750
Amortized Cost | 750 | 2,250
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 0 | 0
Gross unrealized gain - After 1 to 5 years | 0 | 0
Gross unrealized gains | 0 | 0
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 0
Gross unrealized losses - After 1 to 5 years | 0 | 0
Gross unrealized losses | 0 | 0
Fair Value |  |
Fair value - Within 1 year | 500 | 500
Fair value - After 1 to 5 years | 250 | 1,750
Debt securities available-for-sale | $ 750 | $ 2,250
Weighted average yield |  |
Weighted average yield - Within 1 year | 4.33% | 5.00%
Weighted average yield - After 1 to 5 years | 4.79% | 5.50%
Weighted Average Yield | 4.48% | 5.39%

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