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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, 2023 | Dec. 31, 2022 | Oct. 15, 2022
--- | --- | --- | ---
Amortized cost |  |  |
Amortized cost - Within 1 year | $ 7,105,166 |  |
Amortized cost - After 1 to 5 years | 3,699,918 |  |
Amortized cost - After 5 to 10 years | 1,120,446 |  |
Amortized cost - After 10 years | 6,175,633 |  |
Amortized Cost | 18,101,163 | $ 19,562,549 |
Gross unrealized gains |  |  |
Gross unrealized gains | 1,394 | 1,516 |
Gross unrealized loss |  |  |
Gross unrealized losses | 1,373,513 | 1,759,691 |
Fair Value |  |  |
Fair value - Within 1 year | 7,046,274 |  |
Fair value - After 1 to 5 years | 3,525,430 |  |
Fair value - After 5 to 10 years | 1,037,788 |  |
Fair value - After 10 years | 5,119,552 |  |
Debt securities available-for-sale | $ 16,729,044 | $ 17,804,374 |
Weighted average yield |  |  |
Weighted Average Yield | 2.35% | 1.75% |
US Treasury Securities |  |  |
Amortized cost |  |  |
Amortized cost - Within 1 year | $ 7,103,518 | $ 4,576,127 |
Amortized cost - After 1 to 5 years | 3,598,209 | 6,793,739 |
Amortized cost - After 5 to 10 years | 307,512 | 308,854 |
Amortized Cost | 11,009,239 | 11,678,720 |
Gross unrealized gains |  |  |
Gross unrealized gain - Within 1 year | 526 | 506 |
Gross unrealized gain - After 1 to 5 years | 84 | 0 |
Gross unrealized gain - After 5 to 10 years | 0 | 0 |
Gross unrealized gains | 610 | 506 |
Gross unrealized loss |  |  |
Gross unrealized losses - Within 1 year | 59,415 | 47,156 |
Gross unrealized losses - After 1 to 5 years | 170,209 | 410,858 |
Gross unrealized losses - After 5 to 10 years | 33,164 | 40,264 |
Gross unrealized losses | 262,788 | 498,278 | $ 873,000
Fair Value |  |  |
Fair value - Within 1 year | 7,044,629 | 4,529,477 |
Fair value - After 1 to 5 years | 3,428,084 | 6,382,881 |
Fair value - After 5 to 10 years | 274,348 | 268,590 |
Debt securities available-for-sale | $ 10,747,061 | $ 11,180,948 |
Weighted average yield |  |  |
Weighted average yield - Within 1 year | 3.51% | 2.42% |
Weighted average yield - After 1 to 5 years | 1.35% | 1.35% |
Weighted average yield - After 5 to 10 years | 1.63% | 1.63% |
Weighted Average Yield | 2.75% | 1.78% |
Collateralized Mortgage Obligations - Federal agencies |  |  |
Amortized cost |  |  |
Amortized cost - After 1 to 5 years | $ 17,899 | $ 3,914 |
Amortized cost - After 5 to 10 years | 20,503 | 47,979 |
Amortized cost - After 10 years | 108,280 | 127,639 |
Amortized Cost | 146,682 | 179,532 |
Gross unrealized gains |  |  |
Gross unrealized gain - After 1 to 5 years | 0 | 0 |
Gross unrealized gain - After 5 to 10 years | 2 | 0 |
Gross unrealized gain - After 10 years | 29 | 24 |
Gross unrealized gains | 31 | 24 |
Gross unrealized loss |  |  |
Gross unrealized losses - After 1 to 5 years | 838 | 213 |
Gross unrealized losses - After 5 to 10 years | 1,321 | 3,428 |
Gross unrealized losses - After 10 years | 9,868 | 10,719 |
Gross unrealized losses | 12,027 | 14,360 |
Fair Value |  |  |
Fair value - After 1 to 5 years | 17,061 | 3,701 |
Fair value - After 5 to 10 years | 19,184 | 44,551 |
Fair value - After 10 years | 98,441 | 116,944 |
Debt securities available-for-sale | $ 134,686 | $ 165,196 |
Weighted average yield |  |  |
Weighted average yield - After 1 to 5 years | 1.55% | 1.77% |
Weighted average yield - After 5 to 10 years | 2.28% | 1.73% |
Weighted average yield - After 10 years | 2.54% | 2.53% |
Weighted Average Yield | 2.38% | 2.30% |
Mortgage Backed Securities |  |  |
Amortized cost |  |  |
Amortized cost - Within 1 year | $ 637 |  |
Amortized cost - After 1 to 5 years | 82,310 | $ 74,328 |
Amortized cost - After 5 to 10 years | 792,431 | 866,757 |
Amortized cost - After 10 years | 6,067,353 | 6,762,150 |
Amortized Cost | 6,942,731 | 7,703,235 |
Gross unrealized gains |  |  |
Gross unrealized gain - Within 1 year | 0 |  |
Gross unrealized gain - After 1 to 5 years | 11 | 11 |
Gross unrealized gain - After 5 to 10 years | 75 | 43 |
Gross unrealized gain - After 10 years | 667 | 932 |
Gross unrealized gains | 753 | 986 |
Gross unrealized loss |  |  |
Gross unrealized losses - Within 1 year | 3 |  |
Gross unrealized losses - After 1 to 5 years | 3,536 | 3,428 |
Gross unrealized losses - After 5 to 10 years | 48,250 | 58,997 |
Gross unrealized losses - After 10 years | 1,046,909 | 1,184,626 |
Gross unrealized losses | 1,098,698 | 1,247,051 |
Fair Value |  |  |
Fair value - Within 1 year | 634 |  |
Fair value - After 1 to 5 years | 78,785 | 70,911 |
Fair value - After 5 to 10 years | 744,256 | 807,803 |
Fair value - After 10 years | 5,021,111 | 5,578,456 |
Debt securities available-for-sale | $ 5,844,786 | $ 6,457,170 |
Weighted average yield |  |  |
Weighted average yield - Within 1 year | 3.72% |  |
Weighted average yield - After 1 to 5 years | 2.34% | 2.33% |
Weighted average yield - After 5 to 10 years | 2.28% | 2.16% |
Weighted average yield - After 10 years | 1.64% | 1.61% |
Weighted Average Yield | 1.72% | 1.68% |
Other |  |  |
Amortized cost |  |  |
Amortized cost - Within 1 year | $ 1,011 |  |
Amortized cost - After 1 to 5 years | 1,500 | $ 1,062 |
Amortized Cost | 2,511 | 1,062 |
Gross unrealized gains |  |  |
Gross unrealized gain - Within 1 year | 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 |  |
Gross unrealized losses - After 1 to 5 years | 0 | 2 |
Gross unrealized losses | 0 | 2 |
Fair Value |  |  |
Fair value - Within 1 year | 1,011 |  |
Fair value - After 1 to 5 years | 1,500 | 1,060 |
Debt securities available-for-sale | $ 2,511 | $ 1,060 |
Weighted average yield |  |  |
Weighted average yield - Within 1 year | 4.00% |  |
Weighted average yield - After 1 to 5 years | 8.50% | 3.98% |
Weighted Average Yield | 6.69% | 3.98% |

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