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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, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost |  |
Amortized Cost | $ 24,241,078 | $ 21,035,610
Gross unrealized gains |  |
Gross unrealized gains | 313,836 | 527,430
Gross unrealized loss |  |
Gross unrealized losses | 163,688 | 1,888
Fair Value |  |
Debt Securities Available for sale, at fair value | $ 24,391,226 | $ 21,561,152
Weighted average yield |  |
Weighted Average Yield | 1.44% | 1.66%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 2,044,124 | $ 4,900,055
Amortized cost - After 1 to 5 years | 9,119,008 | 5,007,223
Amortized cost - After 5 to 10 years | 3,290,414 | 567,367
Amortized Cost | 14,453,546 | 10,474,645
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 14,907 | 16,479
Gross unrealized gain - After 1 to 5 years | 165,170 | 259,399
Gross unrealized gain - After 5 to 10 years | 6,262 | 37,517
Gross unrealized gains | 186,339 | 313,395
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 2 | 0
Gross unrealized losses - After 1 to 5 years | 10,487 | 0
Gross unrealized losses - After 5 to 10 years | 12,447 | 0
Gross unrealized losses | 22,936 | 0
Fair Value |  |
Fair value - Within 1 year | 2,059,029 | 4,916,534
Fair value - After 1 to 5 years | 9,273,691 | 5,266,622
Fair value - After 5 to 10 years | 3,284,229 | 604,884
Debt Securities Available for sale, at fair value | $ 14,616,949 | $ 10,788,040
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.43% | 0.69%
Weighted average yield - After 1 to 5 years | 1.24% | 2.05%
Weighted average yield - After 5 to 10 years | 1.12% | 1.68%
Weighted Average Yield | 1.25% | 1.40%
Obligations of U.S. Government sponsored entities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 70 | $ 59,993
Amortized cost - After 1 to 5 years |  | 90
Amortized Cost | 70 | 60,083
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 1 | 101
Gross unrealized gain - After 1 to 5 years |  | 0
Gross unrealized gains | 1 | 101
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 0
Gross unrealized losses - After 1 to 5 years |  | 0
Gross unrealized losses | 0 | 0
Fair Value |  |
Fair value - Within 1 year | 71 | 60,094
Fair value - After 1 to 5 years |  | 90
Debt Securities Available for sale, at fair value | $ 71 | $ 60,184
Weighted average yield |  |
Weighted average yield - Within 1 year | 5.63% | 1.46%
Weighted average yield - After 1 to 5 years |  | 5.64%
Weighted Average Yield | 5.63% | 1.47%
Collateralized Mortgage Obligations - Federal agencies |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 527 | $ 1,388
Amortized cost - After 5 to 10 years | 49,410 | 61,229
Amortized cost - After 10 years | 194,123 | 318,292
Amortized Cost | 244,060 | 380,909
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 2 | 14
Gross unrealized gain - After 5 to 10 years | 842 | 1,050
Gross unrealized gain - After 10 years | 5,658 | 10,202
Gross unrealized gains | 6,502 | 11,266
Gross unrealized loss |  |
Gross unrealized losses - After 1 to 5 years | 0 | 0
Gross unrealized losses - After 5 to 10 years | 0 | 0
Gross unrealized losses - After 10 years | 71 | 43
Gross unrealized losses | 71 | 43
Fair Value |  |
Fair value - After 1 to 5 years | 529 | 1,402
Fair value - After 5 to 10 years | 50,252 | 62,279
Fair value - After 10 years | 199,710 | 328,451
Debt Securities Available for sale, at fair value | $ 250,491 | $ 392,132
Weighted average yield |  |
Weighted average yield - After 1 to 5 years | 2.52% | 2.97%
Weighted average yield - After 5 to 10 years | 1.58% | 1.56%
Weighted average yield - After 10 years | 2.10% | 2.04%
Weighted Average Yield | 2.00% | 1.97%
Mortgage Backed Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 5,513 | $ 5,616
Amortized cost - After 1 to 5 years | 55,423 | 50,393
Amortized cost - After 5 to 10 years | 667,142 | 454,880
Amortized cost - After 10 years | 8,815,176 | 9,608,860
Amortized Cost | 9,543,254 | 10,119,749
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 1 | 56
Gross unrealized gain - After 1 to 5 years | 2,549 | 1,735
Gross unrealized gain - After 5 to 10 years | 22,843 | 20,022
Gross unrealized gain - After 10 years | 95,593 | 180,844
Gross unrealized gains | 120,986 | 202,657
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 1 | 0
Gross unrealized losses - After 1 to 5 years | 9 | 0
Gross unrealized losses - After 5 to 10 years | 4 | 6
Gross unrealized losses - After 10 years | 140,667 | 1,839
Gross unrealized losses | 140,681 | 1,845
Fair Value |  |
Fair value - Within 1 year | 5,513 | 5,672
Fair value - After 1 to 5 years | 57,963 | 52,128
Fair value - After 5 to 10 years | 689,981 | 474,896
Fair value - After 10 years | 8,770,102 | 9,787,865
Debt Securities Available for sale, at fair value | $ 9,523,559 | $ 10,320,561
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.98% | 2.83%
Weighted average yield - After 1 to 5 years | 2.35% | 2.35%
Weighted average yield - After 5 to 10 years | 1.92% | 1.91%
Weighted average yield - After 10 years | 1.72% | 1.94%
Weighted Average Yield | 1.74% | 1.94%
Other |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 148 | $ 224
Amortized Cost | 148 | 224
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 8 | 11
Gross unrealized gains | 8 | 11
Gross unrealized loss |  |
Gross unrealized losses - After 1 to 5 years | 0 | 0
Gross unrealized losses | 0 | 0
Fair Value |  |
Fair value - After 1 to 5 years | 156 | 235
Debt Securities Available for sale, at fair value | $ 156 | $ 235
Weighted average yield |  |
Weighted average yield - After 1 to 5 years | 3.62% | 3.62%
Weighted Average Yield | 3.62% | 3.62%

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