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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, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost |  |
Amortized cost - Within 1 year | $ 4,965,664 |
Amortized cost - After 1 to 5 years | 5,059,318 |
Amortized cost - After 5 to 10 years | 1,083,476 |
Amortized cost - After 10 years | 9,927,152 |
Amortized Cost | 21,035,610 | $ 17,542,125
Gross unrealized gains |  |
Gross unrealized gains | 527,430 | 146,165
Gross unrealized loss |  |
Gross unrealized losses | 1,888 | 39,817
Fair Value |  |
Fair value - Within 1 year | 4,982,300 |
Fair value - After 1 to 5 years | 5,320,477 |
Fair value - After 5 to 10 years | 1,142,059 |
Fair value - After 10 years | 10,116,316 |
Debt Securities Available for Sale, at Fair Value | $ 21,561,152 | $ 17,648,473
Weighted average yield |  |
Weighted Average Yield | 1.66% | 2.05%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 4,900,055 | $ 5,071,201
Amortized cost - After 1 to 5 years | 5,007,223 | 5,137,804
Amortized cost - After 5 to 10 years | 567,367 | 1,778,568
Amortized Cost | 10,474,645 | 11,987,573
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 16,479 | 3,262
Gross unrealized gain - After 1 to 5 years | 259,399 | 75,597
Gross unrealized gain - After 5 to 10 years | 37,517 | 429
Gross unrealized gains | 313,395 | 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 | 4,916,534 | 5,073,896
Fair value - After 1 to 5 years | 5,266,622 | 5,209,966
Fair value - After 5 to 10 years | 604,884 | 1,772,393
Debt Securities Available for Sale, at Fair Value | $ 10,788,040 | $ 12,056,255
Weighted average yield |  |
Weighted average yield - Within 1 year | 0.69% | 1.58%
Weighted average yield - After 1 to 5 years | 2.05% | 2.19%
Weighted average yield - After 5 to 10 years | 1.68% | 1.70%
Weighted Average Yield | 1.40% | 1.86%
Obligations of U.S. Government sponsored entities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 59,993 | $ 62,492
Amortized cost - After 1 to 5 years | 90 | 60,021
Amortized Cost | 60,083 | 122,513
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 101 | 2
Gross unrealized gain - After 1 to 5 years | 0 | 0
Gross unrealized gains | 101 | 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 | 60,094 | 62,473
Fair value - After 1 to 5 years | 90 | 59,931
Debt Securities Available for Sale, at Fair Value | $ 60,184 | $ 122,404
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.46% | 1.45%
Weighted average yield - After 1 to 5 years | 5.64% | 1.48%
Weighted Average Yield | 1.47% | 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 |  | $ 236
Amortized cost - After 1 to 5 years | $ 1,388 | 350
Amortized cost - After 5 to 10 years | 61,229 | 85,079
Amortized cost - After 10 years | 318,292 | 504,391
Amortized Cost | 380,909 | 590,056
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year |  | 0
Gross unrealized gain - After 1 to 5 years | 14 | 1
Gross unrealized gain - After 5 to 10 years | 1,050 | 31
Gross unrealized gain - After 10 years | 10,202 | 3,640
Gross unrealized gains | 11,266 | 3,672
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year |  | 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 | 43 | 6,373
Gross unrealized losses | 43 | 7,553
Fair Value |  |
Fair value - Within 1 year |  | 236
Fair value - After 1 to 5 years | 1,402 | 351
Fair value - After 5 to 10 years | 62,279 | 83,930
Fair value - After 10 years | 328,451 | 501,658
Debt Securities Available for Sale, at Fair Value | $ 392,132 | $ 586,175
Weighted average yield |  |
Weighted average yield - Within 1 year |  | 1.83%
Weighted average yield - After 1 to 5 years | 2.97% | 2.16%
Weighted average yield - After 5 to 10 years | 1.56% | 1.63%
Weighted average yield - After 10 years | 2.04% | 2.08%
Weighted Average Yield | 1.97% | 2.02%
Mortgage Backed Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 5,616 | $ 16
Amortized cost - After 1 to 5 years | 50,393 | 36,717
Amortized cost - After 5 to 10 years | 454,880 | 350,373
Amortized cost - After 10 years | 9,608,860 | 4,447,561
Amortized Cost | 10,119,749 | 4,834,667
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 56 | 0
Gross unrealized gain - After 1 to 5 years | 1,735 | 852
Gross unrealized gain - After 5 to 10 years | 20,022 | 1,958
Gross unrealized gain - After 10 years | 180,844 | 60,384
Gross unrealized gains | 202,657 | 63,194
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 0
Gross unrealized losses - After 1 to 5 years | 0 | 1
Gross unrealized losses - After 5 to 10 years | 6 | 1,303
Gross unrealized losses - After 10 years | 1,839 | 20,243
Gross unrealized losses | 1,845 | 21,547
Fair Value |  |
Fair value - Within 1 year | 5,672 | 16
Fair value - After 1 to 5 years | 52,128 | 37,568
Fair value - After 5 to 10 years | 474,896 | 351,028
Fair value - After 10 years | 9,787,865 | 4,487,702
Debt Securities Available for Sale, at Fair Value | $ 10,320,561 | $ 4,876,314
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.83% | 2.13%
Weighted average yield - After 1 to 5 years | 2.35% | 3.38%
Weighted average yield - After 5 to 10 years | 1.91% | 2.02%
Weighted average yield - After 10 years | 1.94% | 2.60%
Weighted Average Yield | 1.94% | 2.57%
Other |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 224 | $ 341
Amortized Cost | 224 | 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 | 235 | 350
Debt Securities Available for Sale, at Fair Value | $ 235 | $ 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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