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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, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost |  |
Amortized cost - Within 1 year | $ 1,225,639 |
Amortized cost - After 1 to 5 years | 10,127,468 |
Amortized cost - After 5 to 10 years | 5,272,106 |
Amortized cost - After 10 years | 8,436,011 |
Amortized Cost | 25,061,224 | $ 21,035,610
Gross unrealized gains |  |
Gross unrealized gains | 205,393 | 527,430
Gross unrealized loss |  |
Gross unrealized losses | 298,348 | 1,888
Fair Value |  |
Fair value - Within 1 year | 1,239,127 |
Fair value - After 1 to 5 years | 10,163,506 |
Fair value - After 5 to 10 years | 5,254,323 |
Fair value - After 10 years | 8,311,313 |
Debt Securities Available for sale, at fair value | $ 24,968,269 | $ 21,561,152
Weighted average yield |  |
Weighted Average Yield | 1.42% | 1.66%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 1,225,558 | $ 4,900,055
Amortized cost - After 1 to 5 years | 10,059,163 | 5,007,223
Amortized cost - After 5 to 10 years | 4,563,265 | 567,367
Amortized Cost | 15,847,986 | 10,474,645
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 13,556 | 16,479
Gross unrealized gain - After 1 to 5 years | 98,808 | 259,399
Gross unrealized gain - After 5 to 10 years | 739 | 37,517
Gross unrealized gains | 113,103 | 313,395
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 69 | 0
Gross unrealized losses - After 1 to 5 years | 65,186 | 0
Gross unrealized losses - After 5 to 10 years | 36,804 | 0
Gross unrealized losses | 102,059 | 0
Fair Value |  |
Fair value - Within 1 year | 1,239,045 | 4,916,534
Fair value - After 1 to 5 years | 10,092,785 | 5,266,622
Fair value - After 5 to 10 years | 4,527,200 | 604,884
Debt Securities Available for sale, at fair value | $ 15,859,030 | $ 10,788,040
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.33% | 0.69%
Weighted average yield - After 1 to 5 years | 1.18% | 2.05%
Weighted average yield - After 5 to 10 years | 1.22% | 1.68%
Weighted Average Yield | 1.27% | 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 | 0 | 101
Gross unrealized gain - After 1 to 5 years |  | 0
Gross unrealized gains | 0 | 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 | 70 | 60,094
Fair value - After 1 to 5 years |  | 90
Debt Securities Available for sale, at fair value | $ 70 | $ 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 | $ 2,433 | $ 1,388
Amortized cost - After 5 to 10 years | 43,241 | 61,229
Amortized cost - After 10 years | 172,176 | 318,292
Amortized Cost | 217,850 | 380,909
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 42 | 14
Gross unrealized gain - After 5 to 10 years | 295 | 1,050
Gross unrealized gain - After 10 years | 3,441 | 10,202
Gross unrealized gains | 3,778 | 11,266
Gross unrealized loss |  |
Gross unrealized losses - After 1 to 5 years | 0 | 0
Gross unrealized losses - After 5 to 10 years | 6 | 0
Gross unrealized losses - After 10 years | 357 | 43
Gross unrealized losses | 363 | 43
Fair Value |  |
Fair value - After 1 to 5 years | 2,475 | 1,402
Fair value - After 5 to 10 years | 43,530 | 62,279
Fair value - After 10 years | 175,260 | 328,451
Debt Securities Available for sale, at fair value | $ 221,265 | $ 392,132
Weighted average yield |  |
Weighted average yield - After 1 to 5 years | 2.16% | 2.97%
Weighted average yield - After 5 to 10 years | 1.54% | 1.56%
Weighted average yield - After 10 years | 2.13% | 2.04%
Weighted Average Yield | 2.01% | 1.97%
Mortgage Backed Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 11 | $ 5,616
Amortized cost - After 1 to 5 years | 65,749 | 50,393
Amortized cost - After 5 to 10 years | 665,600 | 454,880
Amortized cost - After 10 years | 8,263,835 | 9,608,860
Amortized Cost | 8,995,195 | 10,119,749
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 1 | 56
Gross unrealized gain - After 1 to 5 years | 2,380 | 1,735
Gross unrealized gain - After 5 to 10 years | 17,998 | 20,022
Gross unrealized gain - After 10 years | 68,128 | 180,844
Gross unrealized gains | 88,507 | 202,657
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 0
Gross unrealized losses - After 1 to 5 years | 11 | 0
Gross unrealized losses - After 5 to 10 years | 5 | 6
Gross unrealized losses - After 10 years | 195,910 | 1,839
Gross unrealized losses | 195,926 | 1,845
Fair Value |  |
Fair value - Within 1 year | 12 | 5,672
Fair value - After 1 to 5 years | 68,118 | 52,128
Fair value - After 5 to 10 years | 683,593 | 474,896
Fair value - After 10 years | 8,136,053 | 9,787,865
Debt Securities Available for sale, at fair value | $ 8,887,776 | $ 10,320,561
Weighted average yield |  |
Weighted average yield - Within 1 year | 4.79% | 2.83%
Weighted average yield - After 1 to 5 years | 2.23% | 2.35%
Weighted average yield - After 5 to 10 years | 1.97% | 1.91%
Weighted average yield - After 10 years | 1.67% | 1.94%
Weighted Average Yield | 1.69% | 1.94%
Other |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 123 | $ 224
Amortized Cost | 123 | 224
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 5 | 11
Gross unrealized gains | 5 | 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 | 128 | 235
Debt Securities Available for sale, at fair value | $ 128 | $ 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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