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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, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost |  |
Amortized Cost | $ 22,643,708 | $ 21,035,610
Gross unrealized gains |  |
Gross unrealized gains | 379,032 | 527,430
Gross unrealized loss |  |
Gross unrealized losses | 251,131 | 1,888
Fair Value |  |
Debt Securities Available for sale, at fair value | $ 22,771,609 | $ 21,561,152
Weighted average yield |  |
Weighted Average Yield | 1.69% | 1.66%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 1,357,228 | $ 4,900,055
Amortized cost - After 1 to 5 years | 6,089,702 | 5,007,223
Amortized cost - After 5 to 10 years | 4,226,436 | 567,367
Amortized Cost | 11,673,366 | 10,474,645
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 16,087 | 16,479
Gross unrealized gain - After 1 to 5 years | 209,634 | 259,399
Gross unrealized gain - After 5 to 10 years | 7,863 | 37,517
Gross unrealized gains | 233,584 | 313,395
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 0
Gross unrealized losses - After 1 to 5 years | 7,620 | 0
Gross unrealized losses - After 5 to 10 years | 41,553 | 0
Gross unrealized losses | 49,173 | 0
Fair Value |  |
Fair value - Within 1 year | 1,373,315 | 4,916,534
Fair value - After 1 to 5 years | 6,291,716 | 5,266,622
Fair value - After 5 to 10 years | 4,192,746 | 604,884
Debt Securities Available for sale, at fair value | $ 11,857,777 | $ 10,788,040
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.25% | 0.69%
Weighted average yield - After 1 to 5 years | 1.72% | 2.05%
Weighted average yield - After 5 to 10 years | 1.11% | 1.68%
Weighted Average Yield | 1.56% | 1.40%
Obligations of U.S. Government sponsored entities |  |
Amortized cost |  |
Amortized cost - Within 1 year |  | $ 59,993
Amortized cost - After 1 to 5 years | $ 90 | 90
Amortized Cost | 90 | 60,083
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year |  | 101
Gross unrealized gain - After 1 to 5 years | 2 | 0
Gross unrealized gains | 2 | 101
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year |  | 0
Gross unrealized losses - After 1 to 5 years | 0 | 0
Gross unrealized losses | 0 | 0
Fair Value |  |
Fair value - Within 1 year |  | 60,094
Fair value - After 1 to 5 years | 92 | 90
Debt Securities Available for sale, at fair value | $ 92 | $ 60,184
Weighted average yield |  |
Weighted average yield - Within 1 year |  | 1.46%
Weighted average yield - After 1 to 5 years | 5.63% | 5.64%
Weighted Average Yield | 5.63% | 1.47%
Collateralized Mortgage Obligations - Federal agencies |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 1,054 | $ 1,388
Amortized cost - After 5 to 10 years | 54,344 | 61,229
Amortized cost - After 10 years | 273,644 | 318,292
Amortized Cost | 329,042 | 380,909
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 11 | 14
Gross unrealized gain - After 5 to 10 years | 1,085 | 1,050
Gross unrealized gain - After 10 years | 7,930 | 10,202
Gross unrealized gains | 9,026 | 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 | 104 | 43
Gross unrealized losses | 104 | 43
Fair Value |  |
Fair value - After 1 to 5 years | 1,065 | 1,402
Fair value - After 5 to 10 years | 55,429 | 62,279
Fair value - After 10 years | 281,470 | 328,451
Debt Securities Available for sale, at fair value | $ 337,964 | $ 392,132
Weighted average yield |  |
Weighted average yield - After 1 to 5 years | 2.86% | 2.97%
Weighted average yield - After 5 to 10 years | 1.55% | 1.56%
Weighted average yield - After 10 years | 2.04% | 2.04%
Weighted Average Yield | 1.96% | 1.97%
Mortgage Backed Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 5,572 | $ 5,616
Amortized cost - After 1 to 5 years | 63,882 | 50,393
Amortized cost - After 5 to 10 years | 553,299 | 454,880
Amortized cost - After 10 years | 10,018,263 | 9,608,860
Amortized Cost | 10,641,016 | 10,119,749
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 22 | 56
Gross unrealized gain - After 1 to 5 years | 2,892 | 1,735
Gross unrealized gain - After 5 to 10 years | 19,919 | 20,022
Gross unrealized gain - After 10 years | 113,577 | 180,844
Gross unrealized gains | 136,410 | 202,657
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 0
Gross unrealized losses - After 1 to 5 years | 9 | 0
Gross unrealized losses - After 5 to 10 years | 5 | 6
Gross unrealized losses - After 10 years | 201,840 | 1,839
Gross unrealized losses | 201,854 | 1,845
Fair Value |  |
Fair value - Within 1 year | 5,594 | 5,672
Fair value - After 1 to 5 years | 66,765 | 52,128
Fair value - After 5 to 10 years | 573,213 | 474,896
Fair value - After 10 years | 9,930,000 | 9,787,865
Debt Securities Available for sale, at fair value | $ 10,575,572 | $ 10,320,561
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.86% | 2.83%
Weighted average yield - After 1 to 5 years | 2.39% | 2.35%
Weighted average yield - After 5 to 10 years | 1.89% | 1.91%
Weighted average yield - After 10 years | 1.83% | 1.94%
Weighted Average Yield | 1.84% | 1.94%
Other |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 194 | $ 224
Amortized Cost | 194 | 224
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 10 | 11
Gross unrealized gains | 10 | 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 | 204 | 235
Debt Securities Available for sale, at fair value | $ 204 | $ 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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