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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, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost |  |
Amortized Cost | $ 20,621,806 | $ 17,542,125
Gross unrealized gains |  |
Gross unrealized gains | 561,389 | 146,165
Gross unrealized loss |  |
Gross unrealized losses | 5,356 | 39,817
Fair Value |  |
Debt Securities Available for Sale, at Fair Value | $ 21,177,839 | $ 17,648,473
Weighted average yield |  |
Weighted Average Yield | 1.66% | 2.05%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 5,379,791 | $ 5,071,201
Amortized cost - After 1 to 5 years | 5,029,655 | 5,137,804
Amortized cost - After 5 to 10 years | 886,769 | 1,778,568
Amortized Cost | 11,296,215 | 11,987,573
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 16,184 | 3,262
Gross unrealized gain - After 1 to 5 years | 270,498 | 75,597
Gross unrealized gain - After 5 to 10 years | 64,694 | 429
Gross unrealized gains | 351,376 | 79,288
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 567
Gross unrealized losses - After 1 to 5 years | 0 | 3,435
Gross unrealized losses - After 5 to 10 years | 0 | 6,604
Gross unrealized losses | 0 | 10,606
Fair Value |  |
Fair value - Within 1 year | 5,395,975 | 5,073,896
Fair value - After 1 to 5 years | 5,300,153 | 5,209,966
Fair value - After 5 to 10 years | 951,463 | 1,772,393
Debt Securities Available for Sale, at Fair Value | $ 11,647,591 | $ 12,056,255
Weighted average yield |  |
Weighted average yield - Within 1 year | 0.65% | 1.58%
Weighted average yield - After 1 to 5 years | 2.09% | 2.19%
Weighted average yield - After 5 to 10 years | 1.72% | 1.70%
Weighted Average Yield | 1.37% | 1.86%
Obligations of U.S. Government sponsored entities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 59,977 | $ 62,492
Amortized cost - After 1 to 5 years | 90 | 60,021
Amortized Cost | 60,067 | 122,513
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 302 | 2
Gross unrealized gain - After 1 to 5 years | 2 | 0
Gross unrealized gains | 304 | 2
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 21
Gross unrealized losses - After 1 to 5 years | 0 | 90
Gross unrealized losses | 0 | 111
Fair Value |  |
Fair value - Within 1 year | 60,279 | 62,473
Fair value - After 1 to 5 years | 92 | 59,931
Debt Securities Available for Sale, at Fair Value | $ 60,371 | $ 122,404
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.47% | 1.45%
Weighted average yield - After 1 to 5 years | 5.63% | 1.48%
Weighted Average Yield | 1.48% | 1.47%
Obligations of Puerto Rico, States and political subdivisions |  |
Amortized cost |  |
Amortized cost - Within 1 year |  | $ 6,975
Amortized Cost |  | 6,975
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year |  | 0
Gross unrealized gains |  | 0
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year |  | 0
Gross unrealized losses |  | 0
Fair Value |  |
Fair value - Within 1 year |  | 6,975
Debt Securities Available for Sale, at Fair Value |  | $ 6,975
Weighted average yield |  |
Weighted average yield - Within 1 year |  | 0.00%
Weighted Average Yield |  | 0.00%
Collateralized Mortgage Obligations - Federal agencies |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 20 | $ 236
Amortized cost - After 1 to 5 years | 239 | 350
Amortized cost - After 5 to 10 years | 69,780 | 85,079
Amortized cost - After 10 years | 367,974 | 504,391
Amortized Cost | 438,013 | 590,056
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 0 | 0
Gross unrealized gain - After 1 to 5 years | 3 | 1
Gross unrealized gain - After 5 to 10 years | 1,184 | 31
Gross unrealized gain - After 10 years | 11,167 | 3,640
Gross unrealized gains | 12,354 | 3,672
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 0
Gross unrealized losses - After 1 to 5 years | 0 | 0
Gross unrealized losses - After 5 to 10 years | 0 | 1,180
Gross unrealized losses - After 10 years | 61 | 6,373
Gross unrealized losses | 61 | 7,553
Fair Value |  |
Fair value - Within 1 year | 20 | 236
Fair value - After 1 to 5 years | 242 | 351
Fair value - After 5 to 10 years | 70,964 | 83,930
Fair value - After 10 years | 379,080 | 501,658
Debt Securities Available for Sale, at Fair Value | $ 450,306 | $ 586,175
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.37% | 1.83%
Weighted average yield - After 1 to 5 years | 2.16% | 2.16%
Weighted average yield - After 5 to 10 years | 1.62% | 1.63%
Weighted average yield - After 10 years | 2.03% | 2.08%
Weighted Average Yield | 1.98% | 2.02%
Mortgage Backed Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year |  | $ 16
Amortized cost - After 1 to 5 years | $ 63,157 | 36,717
Amortized cost - After 5 to 10 years | 389,976 | 350,373
Amortized cost - After 10 years | 8,374,132 | 4,447,561
Amortized Cost | 8,827,265 | 4,834,667
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year |  | 0
Gross unrealized gain - After 1 to 5 years | 2,071 | 852
Gross unrealized gain - After 5 to 10 years | 16,636 | 1,958
Gross unrealized gain - After 10 years | 178,637 | 60,384
Gross unrealized gains | 197,344 | 63,194
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year |  | 0
Gross unrealized losses - After 1 to 5 years | 8 | 1
Gross unrealized losses - After 5 to 10 years | 15 | 1,303
Gross unrealized losses - After 10 years | 5,272 | 20,243
Gross unrealized losses | 5,295 | 21,547
Fair Value |  |
Fair value - Within 1 year |  | 16
Fair value - After 1 to 5 years | 65,220 | 37,568
Fair value - After 5 to 10 years | 406,597 | 351,028
Fair value - After 10 years | 8,547,497 | 4,487,702
Debt Securities Available for Sale, at Fair Value | $ 9,019,314 | $ 4,876,314
Weighted average yield |  |
Weighted average yield - Within 1 year |  | 2.13%
Weighted average yield - After 1 to 5 years | 2.39% | 3.38%
Weighted average yield - After 5 to 10 years | 1.86% | 2.02%
Weighted average yield - After 10 years | 2.05% | 2.60%
Weighted Average Yield | 2.05% | 2.57%
Other |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 246 | $ 341
Amortized Cost | 246 | 341
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 11 | 9
Gross unrealized gains | 11 | 9
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 | 257 | 350
Debt Securities Available for Sale, at Fair Value | $ 257 | $ 350
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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