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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, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost |  |
Amortized cost - Within 1 year | $ 5,140,920 |
Amortized cost - After 1 to 5 years | 5,235,233 |
Amortized cost - After 5 to 10 years | 2,214,020 |
Amortized cost - After 10 years | 4,951,952 |
Amortized Cost | 17,542,125 | $ 13,478,562
Gross unrealized gains |  |
Gross unrealized gains | 146,165 | 30,929
Gross unrealized loss |  |
Gross unrealized losses | 39,817 | 209,307
Fair Value |  |
Fair value - Within 1 year | 5,143,596 |
Fair value - After 1 to 5 years | 5,308,166 |
Fair value - After 5 to 10 years | 2,207,351 |
Fair value - After 10 years | 4,989,360 |
Debt Securities Available for Sale, at Fair Value | $ 17,648,473 | $ 13,300,184
Weighted average yield |  |
Weighted Average Yield | 2.05% | 2.25%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 5,071,201 | $ 3,565,571
Amortized cost - After 1 to 5 years | 5,137,804 | 4,483,741
Amortized cost - After 5 to 10 years | 1,778,568 | 245,891
Amortized Cost | 11,987,573 | 8,295,203
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 3,262 | 108
Gross unrealized gain - After 1 to 5 years | 75,597 | 13,647
Gross unrealized gain - After 5 to 10 years | 429 | 3,770
Gross unrealized gains | 79,288 | 17,525
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 567 | 5,319
Gross unrealized losses - After 1 to 5 years | 3,435 | 35,213
Gross unrealized losses - After 5 to 10 years | 6,604 | 0
Gross unrealized losses | 10,606 | 40,532
Fair Value |  |
Fair value - Within 1 year | 5,073,896 | 3,560,360
Fair value - After 1 to 5 years | 5,209,966 | 4,462,175
Fair value - After 5 to 10 years | 1,772,393 | 249,661
Debt Securities Available for Sale, at Fair Value | $ 12,056,255 | $ 8,272,196
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.58% | 2.10%
Weighted average yield - After 1 to 5 years | 2.19% | 2.25%
Weighted average yield - After 5 to 10 years | 1.70% | 2.84%
Weighted Average Yield | 1.86% | 2.21%
Obligations of U.S. Government sponsored entities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 62,492 | $ 212,951
Amortized cost - After 1 to 5 years | 60,021 | 123,857
Amortized Cost | 122,513 | 336,808
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 2 | 0
Gross unrealized gain - After 1 to 5 years | 0 | 1
Gross unrealized gains | 2 | 1
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 21 | 1,406
Gross unrealized losses - After 1 to 5 years | 90 | 2,094
Gross unrealized losses | 111 | 3,500
Fair Value |  |
Fair value - Within 1 year | 62,473 | 211,545
Fair value - After 1 to 5 years | 59,931 | 121,764
Debt Securities Available for Sale, at Fair Value | $ 122,404 | $ 333,309
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.45% | 1.44%
Weighted average yield - After 1 to 5 years | 1.48% | 1.51%
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 - After 1 to 5 years |  | $ 6,926
Amortized Cost | 6,975 | 6,926
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 0 |
Gross unrealized gain - After 1 to 5 years |  | 0
Gross unrealized gains | 0 | 0
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 |
Gross unrealized losses - After 1 to 5 years |  | 184
Gross unrealized losses | 0 | 184
Fair Value |  |
Fair value - Within 1 year | 6,975 |
Fair value - After 1 to 5 years |  | 6,742
Debt Securities Available for Sale, at Fair Value | $ 6,975 | $ 6,742
Weighted average yield |  |
Weighted average yield - Within 1 year | 0.00% |
Weighted average yield - After 1 to 5 years |  | 0.70%
Weighted Average Yield | 0.00% | 0.70%
Collateralized Mortgage Obligations - Federal agencies |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 236 |
Amortized cost - After 1 to 5 years | 350 | $ 749
Amortized cost - After 5 to 10 years | 85,079 | 115,744
Amortized cost - After 10 years | 504,391 | 638,995
Amortized Cost | 590,056 | 755,488
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 0 |
Gross unrealized gain - After 1 to 5 years | 1 | 0
Gross unrealized gain - After 5 to 10 years | 31 | 1
Gross unrealized gain - After 10 years | 3,640 | 1,584
Gross unrealized gains | 3,672 | 1,585
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 |
Gross unrealized losses - After 1 to 5 years | 0 | 7
Gross unrealized losses - After 5 to 10 years | 1,180 | 4,715
Gross unrealized losses - After 10 years | 6,373 | 23,680
Gross unrealized losses | 7,553 | 28,402
Fair Value |  |
Fair value - Within 1 year | 236 |
Fair value - After 1 to 5 years | 351 | 742
Fair value - After 5 to 10 years | 83,930 | 111,030
Fair value - After 10 years | 501,658 | 616,899
Debt Securities Available for Sale, at Fair Value | $ 586,175 | $ 728,671
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.83% |
Weighted average yield - After 1 to 5 years | 2.16% | 1.92%
Weighted average yield - After 5 to 10 years | 1.63% | 1.71%
Weighted average yield - After 10 years | 2.08% | 2.10%
Weighted Average Yield | 2.02% | 2.04%
Mortgage Backed Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 16 | $ 431
Amortized cost - After 1 to 5 years | 36,717 | 6,762
Amortized cost - After 5 to 10 years | 350,373 | 365,727
Amortized cost - After 10 years | 4,447,561 | 3,710,731
Amortized Cost | 4,834,667 | 4,083,651
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 0 | 4
Gross unrealized gain - After 1 to 5 years | 852 | 43
Gross unrealized gain - After 5 to 10 years | 1,958 | 1,090
Gross unrealized gain - After 10 years | 60,384 | 10,679
Gross unrealized gains | 63,194 | 11,816
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 0
Gross unrealized losses - After 1 to 5 years | 1 | 1
Gross unrealized losses - After 5 to 10 years | 1,303 | 8,499
Gross unrealized losses - After 10 years | 20,243 | 128,189
Gross unrealized losses | 21,547 | 136,689
Fair Value |  |
Fair value - Within 1 year | 16 | 435
Fair value - After 1 to 5 years | 37,568 | 6,804
Fair value - After 5 to 10 years | 351,028 | 358,318
Fair value - After 10 years | 4,487,702 | 3,593,221
Debt Securities Available for Sale, at Fair Value | $ 4,876,314 | $ 3,958,778
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.13% | 4.30%
Weighted average yield - After 1 to 5 years | 3.38% | 2.74%
Weighted average yield - After 5 to 10 years | 2.02% | 2.19%
Weighted average yield - After 10 years | 2.60% | 2.45%
Weighted Average Yield | 2.57% | 2.43%
Other |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 341 |
Amortized cost - After 5 to 10 years |  | $ 486
Amortized Cost | 341 | 486
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 9 |
Gross unrealized gain - After 5 to 10 years |  | 2
Gross unrealized gains | 9 | 2
Gross unrealized loss |  |
Gross unrealized losses - After 1 to 5 years | 0 |
Gross unrealized losses - After 5 to 10 years |  | 0
Gross unrealized losses | 0 | 0
Fair Value |  |
Fair value - After 1 to 5 years | 350 |
Fair value - After 5 to 10 years |  | 488
Debt Securities Available for Sale, at Fair Value | $ 350 | $ 488
Weighted average yield |  |
Weighted average yield - After 1 to 5 years | 3.62% |
Weighted average yield - After 5 to 10 years |  | 3.62%
Weighted Average Yield | 3.62% | 3.62%

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