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Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost |  |
Amortized Cost | $ 22,129,856 | $ 21,035,610
Gross unrealized gains |  |
Gross unrealized gains | 352,718 | 527,430
Gross unrealized loss |  |
Gross unrealized losses | 147,407 | 1,888
Fair Value |  |
Debt Securities Available for sale, at fair value | $ 22,335,167 | $ 21,561,152
Weighted average yield |  |
Weighted Average Yield | 1.62% | 1.66%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 1,723,731 | $ 4,900,055
Amortized cost - After 1 to 5 years | 6,291,688 | 5,007,223
Amortized cost - After 5 to 10 years | 3,758,768 | 567,367
Amortized Cost | 11,774,187 | 10,474,645
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 15,416 | 16,479
Gross unrealized gain - After 1 to 5 years | 192,969 | 259,399
Gross unrealized gain - After 5 to 10 years | 12,635 | 37,517
Gross unrealized gains | 221,020 | 313,395
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 1 | 0
Gross unrealized losses - After 1 to 5 years | 7,302 | 0
Gross unrealized losses - After 5 to 10 years | 8,590 | 0
Gross unrealized losses | 15,893 | 0
Fair Value |  |
Fair value - Within 1 year | 1,739,146 | 4,916,534
Fair value - After 1 to 5 years | 6,477,355 | 5,266,622
Fair value - After 5 to 10 years | 3,762,813 | 604,884
Debt Securities Available for sale, at fair value | $ 11,979,314 | $ 10,788,040
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.78% | 0.69%
Weighted average yield - After 1 to 5 years | 1.64% | 2.05%
Weighted average yield - After 5 to 10 years | 1.09% | 1.68%
Weighted Average Yield | 1.49% | 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 | 0 | 0
Gross unrealized gains | 0 | 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 | 90 | 90
Debt Securities Available for sale, at fair value | $ 90 | $ 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 | $ 858 | $ 1,388
Amortized cost - After 5 to 10 years | 50,612 | 61,229
Amortized cost - After 10 years | 223,593 | 318,292
Amortized Cost | 275,063 | 380,909
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 7 | 14
Gross unrealized gain - After 5 to 10 years | 947 | 1,050
Gross unrealized gain - After 10 years | 6,926 | 10,202
Gross unrealized gains | 7,880 | 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 | 21 | 43
Gross unrealized losses | 21 | 43
Fair Value |  |
Fair value - After 1 to 5 years | 865 | 1,402
Fair value - After 5 to 10 years | 51,559 | 62,279
Fair value - After 10 years | 230,498 | 328,451
Debt Securities Available for sale, at fair value | $ 282,922 | $ 392,132
Weighted average yield |  |
Weighted average yield - After 1 to 5 years | 2.78% | 2.97%
Weighted average yield - After 5 to 10 years | 1.57% | 1.56%
Weighted average yield - After 10 years | 2.08% | 2.04%
Weighted Average Yield | 1.99% | 1.97%
Mortgage Backed Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 5,543 | $ 5,616
Amortized cost - After 1 to 5 years | 58,649 | 50,393
Amortized cost - After 5 to 10 years | 625,776 | 454,880
Amortized cost - After 10 years | 9,390,381 | 9,608,860
Amortized Cost | 10,080,349 | 10,119,749
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 0 | 56
Gross unrealized gain - After 1 to 5 years | 2,799 | 1,735
Gross unrealized gain - After 5 to 10 years | 21,805 | 20,022
Gross unrealized gain - After 10 years | 99,205 | 180,844
Gross unrealized gains | 123,809 | 202,657
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 1 | 0
Gross unrealized losses - After 1 to 5 years | 11 | 0
Gross unrealized losses - After 5 to 10 years | 4 | 6
Gross unrealized losses - After 10 years | 131,477 | 1,839
Gross unrealized losses | 131,493 | 1,845
Fair Value |  |
Fair value - Within 1 year | 5,542 | 5,672
Fair value - After 1 to 5 years | 61,437 | 52,128
Fair value - After 5 to 10 years | 647,577 | 474,896
Fair value - After 10 years | 9,358,109 | 9,787,865
Debt Securities Available for sale, at fair value | $ 10,072,665 | $ 10,320,561
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.71% | 2.83%
Weighted average yield - After 1 to 5 years | 2.38% | 2.35%
Weighted average yield - After 5 to 10 years | 1.90% | 1.91%
Weighted average yield - After 10 years | 1.78% | 1.94%
Weighted Average Yield | 1.78% | 1.94%
Other |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 167 | $ 224
Amortized Cost | 167 | 224
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 9 | 11
Gross unrealized gains | 9 | 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 | 176 | 235
Debt Securities Available for sale, at fair value | $ 176 | $ 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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