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Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost |  |
Amortized cost - Within 1 year | $ 10,556,673 |
Amortized cost - After 1 to 5 years | 2,639,766 |
Amortized cost - After 5 to 10 years | 748,840 |
Amortized cost - After 10 years | 5,572,616 |
Amortized Cost | 19,517,895 | $ 18,101,163
Gross unrealized gains |  |
Gross unrealized gains | 1,992 | 1,394
Gross unrealized loss |  |
Gross unrealized losses | 1,273,984 | 1,373,513
Fair Value |  |
Fair value - Within 1 year | 10,511,675 |
Fair value - After 1 to 5 years | 2,573,499 |
Fair value - After 5 to 10 years | 702,940 |
Fair value - After 10 years | 4,457,789 |
Debt securities available-for-sale | $ 18,245,903 | $ 16,729,044
Weighted average yield |  |
Weighted Average Yield | 2.78% | 2.35%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 10,555,397 | $ 7,103,518
Amortized cost - After 1 to 5 years | 2,547,936 | 3,598,209
Amortized cost - After 5 to 10 years |  | 307,512
Amortized Cost | 13,103,333 | 11,009,239
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 1,282 | 526
Gross unrealized gain - After 1 to 5 years | 151 | 84
Gross unrealized gain - After 5 to 10 years |  | 0
Gross unrealized gains | 1,433 | 610
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 46,275 | 59,415
Gross unrealized losses - After 1 to 5 years | 63,381 | 170,209
Gross unrealized losses - After 5 to 10 years |  | 33,164
Gross unrealized losses | 109,656 | 262,788
Fair Value |  |
Fair value - Within 1 year | 10,510,404 | 7,044,629
Fair value - After 1 to 5 years | 2,484,706 | 3,428,084
Fair value - After 5 to 10 years |  | 274,348
Debt securities available-for-sale | $ 12,995,110 | $ 10,747,061
Weighted average yield |  |
Weighted average yield - Within 1 year | 3.33% | 3.51%
Weighted average yield - After 1 to 5 years | 3.07% | 1.35%
Weighted average yield - After 5 to 10 years |  | 1.63%
Weighted Average Yield | 3.28% | 2.75%
Collateralized Mortgage Obligations - Federal agencies |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 10,538 | $ 17,899
Amortized cost - After 5 to 10 years | 15,334 | 20,503
Amortized cost - After 10 years | 104,168 | 108,280
Amortized Cost | 130,040 | 146,682
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 0 | 0
Gross unrealized gain - After 5 to 10 years | 0 | 2
Gross unrealized gain - After 10 years | 132 | 29
Gross unrealized gains | 132 | 31
Gross unrealized loss |  |
Gross unrealized losses - After 1 to 5 years | 345 | 838
Gross unrealized losses - After 5 to 10 years | 904 | 1,321
Gross unrealized losses - After 10 years | 8,639 | 9,868
Gross unrealized losses | 9,888 | 12,027
Fair Value |  |
Fair value - After 1 to 5 years | 10,193 | 17,061
Fair value - After 5 to 10 years | 14,430 | 19,184
Fair value - After 10 years | 95,661 | 98,441
Debt securities available-for-sale | $ 120,284 | $ 134,686
Weighted average yield |  |
Weighted average yield - After 1 to 5 years | 1.53% | 1.55%
Weighted average yield - After 5 to 10 years | 2.24% | 2.28%
Weighted average yield - After 10 years | 2.76% | 2.54%
Weighted Average Yield | 2.60% | 2.38%
Mortgge Backed Securities - Federal agencies |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 776 | $ 637
Amortized cost - After 1 to 5 years | 79,542 | 82,310
Amortized cost - After 5 to 10 years | 733,506 | 792,431
Amortized cost - After 10 years | 5,468,448 | 6,067,353
Amortized Cost | 6,282,272 | 6,942,731
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 0 | 0
Gross unrealized gain - After 1 to 5 years | 8 | 11
Gross unrealized gain - After 5 to 10 years | 82 | 75
Gross unrealized gain - After 10 years | 337 | 667
Gross unrealized gains | 427 | 753
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 5 | 3
Gross unrealized losses - After 1 to 5 years | 2,700 | 3,536
Gross unrealized losses - After 5 to 10 years | 45,078 | 48,250
Gross unrealized losses - After 10 years | 1,106,657 | 1,046,909
Gross unrealized losses | 1,154,440 | 1,098,698
Fair Value |  |
Fair value - Within 1 year | 771 | 634
Fair value - After 1 to 5 years | 76,850 | 78,785
Fair value - After 5 to 10 years | 688,510 | 744,256
Fair value - After 10 years | 4,362,128 | 5,021,111
Debt securities available-for-sale | $ 5,128,259 | $ 5,844,786
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.65% | 3.72%
Weighted average yield - After 1 to 5 years | 2.35% | 2.34%
Weighted average yield - After 5 to 10 years | 2.37% | 2.28%
Weighted average yield - After 10 years | 1.67% | 1.64%
Weighted Average Yield | 1.75% | 1.72%
Other |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 500 | $ 1,011
Amortized cost - After 1 to 5 years | 1,750 | 1,500
Amortized Cost | 2,250 | 2,511
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 | 1,011
Fair value - After 1 to 5 years | 1,750 | 1,500
Debt securities available-for-sale | $ 2,250 | $ 2,511
Weighted average yield |  |
Weighted average yield - Within 1 year | 5.00% | 4.00%
Weighted average yield - After 1 to 5 years | 5.50% | 8.50%
Weighted Average Yield | 5.39% | 6.69%

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