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Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost |  |
Amortized Cost | $ 19,462,981 | $ 18,101,163
Allowance for credit losses |  |
Allowance for credit losses | 500 | 0
Gross unrealized gains |  |
Gross unrealized gains | 725 | 1,394
Gross unrealized loss |  |
Gross unrealized losses | 1,445,782 | 1,373,513
Fair Value |  |
Debt securities available-for-sale | $ 18,017,424 | $ 16,729,044
Weighted average yield |  |
Weighted Average Yield | 2.72% | 2.35%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 9,394,716 | $ 7,103,518
Amortized cost - After 1 to 5 years | 2,825,336 | 3,598,209
Amortized cost - After 5 to 10 years | 307,174 | 307,512
Amortized Cost | 12,527,226 | 11,009,239
Allowance for credit losses |  |
Allowance for credit losses - Within 1 year | 0 |
Allowance for credit losses - After 1 to 5 years | 0 |
Allowance for credit losses - After 5 to 10 years | 0 |
Allowance for credit losses | 0 |
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 68 | 526
Gross unrealized gain - After 1 to 5 years | 0 | 84
Gross unrealized gain - After 5 to 10 years | 0 | 0
Gross unrealized gains | 68 | 610
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 60,864 | 59,415
Gross unrealized losses - After 1 to 5 years | 140,775 | 170,209
Gross unrealized losses - After 5 to 10 years | 36,444 | 33,164
Gross unrealized losses | 238,083 | 262,788
Fair Value |  |
Fair value - Within 1 year | 9,333,920 | 7,044,629
Fair value - After 1 to 5 years | 2,684,561 | 3,428,084
Fair value - After 5 to 10 years | 270,730 | 274,348
Debt securities available-for-sale | $ 12,289,211 | $ 10,747,061
Weighted average yield |  |
Weighted average yield - Within 1 year | 3.90% | 3.51%
Weighted average yield - After 1 to 5 years | 1.32% | 1.35%
Weighted average yield - After 5 to 10 years | 1.63% | 1.63%
Weighted Average Yield | 3.26% | 2.75%
Collateralized Mortgage Obligations - Federal agencies |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 15,883 | $ 17,899
Amortized cost - After 5 to 10 years | 19,189 | 20,503
Amortized cost - After 10 years | 104,671 | 108,280
Amortized Cost | 139,743 | 146,682
Allowance for credit losses |  |
Allowance for credit losses - After 1 to 5 years | 0 |
Allowance for credit losses - After 5 to 10 years | 0 |
Allowance for credit losses - After 10 years | 0 |
Allowance for credit losses | 0 |
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 | 21 | 29
Gross unrealized gains | 21 | 31
Gross unrealized loss |  |
Gross unrealized losses - After 1 to 5 years | 813 | 838
Gross unrealized losses - After 5 to 10 years | 1,337 | 1,321
Gross unrealized losses - After 10 years | 10,006 | 9,868
Gross unrealized losses | 12,156 | 12,027
Fair Value |  |
Fair value - After 1 to 5 years | 15,070 | 17,061
Fair value - After 5 to 10 years | 17,852 | 19,184
Fair value - After 10 years | 94,686 | 98,441
Debt securities available-for-sale | $ 127,608 | $ 134,686
Weighted average yield |  |
Weighted average yield - After 1 to 5 years | 1.54% | 1.55%
Weighted average yield - After 5 to 10 years | 2.29% | 2.28%
Weighted average yield - After 10 years | 2.55% | 2.54%
Weighted Average Yield | 2.40% | 2.38%
Mortgage Backed Securities - federal agencies |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 457 | $ 637
Amortized cost - After 1 to 5 years | 78,628 | 82,310
Amortized cost - After 5 to 10 years | 817,332 | 792,431
Amortized cost - After 10 years | 5,897,090 | 6,067,353
Amortized Cost | 6,793,507 | 6,942,731
Allowance for credit losses |  |
Allowance for credit losses - Within 1 year | 0 |
Allowance for credit losses - After 1 to 5 years | 0 |
Allowance for credit losses - After 5 to 10 years | 0 |
Allowance for credit losses - After 10 years | 0 |
Allowance for credit losses | 0 |
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 0 | 0
Gross unrealized gain - After 1 to 5 years | 6 | 11
Gross unrealized gain - After 5 to 10 years | 181 | 75
Gross unrealized gain - After 10 years | 449 | 667
Gross unrealized gains | 636 | 753
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 5 | 3
Gross unrealized losses - After 1 to 5 years | 3,683 | 3,536
Gross unrealized losses - After 5 to 10 years | 56,576 | 48,250
Gross unrealized losses - After 10 years | 1,135,279 | 1,046,909
Gross unrealized losses | 1,195,543 | 1,098,698
Fair Value |  |
Fair value - Within 1 year | 452 | 634
Fair value - After 1 to 5 years | 74,951 | 78,785
Fair value - After 5 to 10 years | 760,937 | 744,256
Fair value - After 10 years | 4,762,260 | 5,021,111
Debt securities available-for-sale | $ 5,598,600 | $ 5,844,786
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.06% | 3.72%
Weighted average yield - After 1 to 5 years | 2.36% | 2.34%
Weighted average yield - After 5 to 10 years | 2.33% | 2.28%
Weighted average yield - After 10 years | 1.65% | 1.64%
Weighted Average Yield | 1.74% | 1.72%
Other |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 1,005 | $ 1,011
Amortized cost - After 1 to 5 years | 1,500 | 1,500
Amortized Cost | 2,505 | 2,511
Allowance for credit losses |  |
Allowance for credit losses - Within 1 year | 500 |
Allowance for credit losses - After 1 to 5 years | 0 |
Allowance for credit losses | 500 |
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 | 505 | 1,011
Fair value - After 1 to 5 years | 1,500 | 1,500
Debt securities available-for-sale | $ 2,005 | $ 2,511
Weighted average yield |  |
Weighted average yield - Within 1 year | 4.00% | 4.00%
Weighted average yield - After 1 to 5 years | 8.50% | 8.50%
Weighted Average Yield | 6.69% | 6.69%

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