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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, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost |  |
Amortized Cost | $ 15,259,832 | $ 17,542,125
Gross unrealized gains |  |
Gross unrealized gains | 555,852 | 146,165
Gross unrealized loss |  |
Gross unrealized losses | 2,383 | 39,817
Fair Value |  |
Debt Securities Available for Sale, at Fair Value | $ 15,813,301 | $ 17,648,473
Weighted average yield |  |
Weighted Average Yield | 2.04% | 2.05%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 3,401,265 | $ 5,071,201
Amortized cost - After 1 to 5 years | 5,109,362 | 5,137,804
Amortized cost - After 5 to 10 years | 1,516,770 | 1,778,568
Amortized Cost | 10,027,397 | 11,987,573
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 16,188 | 3,262
Gross unrealized gain - After 1 to 5 years | 271,488 | 75,597
Gross unrealized gain - After 5 to 10 years | 102,440 | 429
Gross unrealized gains | 390,116 | 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 | 3,417,453 | 5,073,896
Fair value - After 1 to 5 years | 5,380,850 | 5,209,966
Fair value - After 5 to 10 years | 1,619,210 | 1,772,393
Debt Securities Available for Sale, at Fair Value | $ 10,417,513 | $ 12,056,255
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.50% | 1.58%
Weighted average yield - After 1 to 5 years | 2.16% | 2.19%
Weighted average yield - After 5 to 10 years | 1.70% | 1.70%
Weighted Average Yield | 1.87% | 1.86%
Obligations of U.S. Government sponsored entities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 85,638 | $ 62,492
Amortized cost - After 1 to 5 years | 90 | 60,021
Amortized Cost | 85,728 | 122,513
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 606 | 2
Gross unrealized gain - After 1 to 5 years | 2 | 0
Gross unrealized gains | 608 | 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 | 86,244 | 62,473
Fair value - After 1 to 5 years | 92 | 59,931
Debt Securities Available for Sale, at Fair Value | $ 86,336 | $ 122,404
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.48% | 1.45%
Weighted average yield - After 1 to 5 years | 5.64% | 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 | $ 156 | $ 236
Amortized cost - After 1 to 5 years | 1,009 | 350
Amortized cost - After 5 to 10 years | 79,853 | 85,079
Amortized cost - After 10 years | 469,095 | 504,391
Amortized Cost | 550,113 | 590,056
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 0 | 0
Gross unrealized gain - After 1 to 5 years | 8 | 1
Gross unrealized gain - After 5 to 10 years | 1,066 | 31
Gross unrealized gain - After 10 years | 11,263 | 3,640
Gross unrealized gains | 12,337 | 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 | 1,614 | 6,373
Gross unrealized losses | 1,614 | 7,553
Fair Value |  |
Fair value - Within 1 year | 156 | 236
Fair value - After 1 to 5 years | 1,017 | 351
Fair value - After 5 to 10 years | 80,919 | 83,930
Fair value - After 10 years | 478,744 | 501,658
Debt Securities Available for Sale, at Fair Value | $ 560,836 | $ 586,175
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.77% | 1.83%
Weighted average yield - After 1 to 5 years | 2.55% | 2.16%
Weighted average yield - After 5 to 10 years | 1.61% | 1.63%
Weighted average yield - After 10 years | 2.06% | 2.08%
Weighted Average Yield | 1.99% | 2.02%
Mortgage Backed Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 17 | $ 16
Amortized cost - After 1 to 5 years | 39,494 | 36,717
Amortized cost - After 5 to 10 years | 349,654 | 350,373
Amortized cost - After 10 years | 4,207,124 | 4,447,561
Amortized Cost | 4,596,289 | 4,834,667
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 1 | 0
Gross unrealized gain - After 1 to 5 years | 1,299 | 852
Gross unrealized gain - After 5 to 10 years | 9,573 | 1,958
Gross unrealized gain - After 10 years | 141,907 | 60,384
Gross unrealized gains | 152,780 | 63,194
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 0
Gross unrealized losses - After 1 to 5 years | 15 | 1
Gross unrealized losses - After 5 to 10 years | 21 | 1,303
Gross unrealized losses - After 10 years | 733 | 20,243
Gross unrealized losses | 769 | 21,547
Fair Value |  |
Fair value - Within 1 year | 18 | 16
Fair value - After 1 to 5 years | 40,778 | 37,568
Fair value - After 5 to 10 years | 359,206 | 351,028
Fair value - After 10 years | 4,348,298 | 4,487,702
Debt Securities Available for Sale, at Fair Value | $ 4,748,300 | $ 4,876,314
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.18% | 2.13%
Weighted average yield - After 1 to 5 years | 3.12% | 3.38%
Weighted average yield - After 5 to 10 years | 1.47% | 2.02%
Weighted average yield - After 10 years | 2.52% | 2.60%
Weighted Average Yield | 2.45% | 2.57%
Other |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 305 | $ 341
Amortized Cost | 305 | 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 | 316 | 350
Debt Securities Available for Sale, at Fair Value | $ 316 | $ 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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