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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, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities available-for-sale, at fair value | $ 16,479,110 | $ 13,300,184
Gross Unrealized Gains | 163,664 | 30,929
Gross Unrealized Losses | 36,297 | 209,307
Amortized Cost | 16,351,743 | 13,478,562
Amortized cost |  |
Amortized Cost | 16,351,743 | 13,478,562
Gross unrealized gains |  |
Gross unrealized gains | 163,664 | 30,929
Gross unrealized loss |  |
Gross unrealized losses | $ 36,297 | $ 209,307
Weighted average yield |  |
Weighted Average Yield | 2.20% | 2.25%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 5,593,503 | $ 3,565,571
Amortized cost - After 1 to 5 years | 4,200,129 | 4,483,741
Amortized cost - After 5 to 10 years | 624,188 | 245,891
Amortized Cost | 10,417,820 | 8,295,203
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 2,924 | 108
Gross unrealized gain - After 1 to 5 years | 86,143 | 13,647
Gross unrealized gain - After 5 to 10 years | 1,912 | 3,770
Gross unrealized gains | 90,979 | 17,525
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 1,789 | 5,319
Gross unrealized losses - After 1 to 5 years | 862 | 35,213
Gross unrealized losses - After 5 to 10 years | 1,860 | 0
Gross unrealized losses | 4,511 | 40,532
Fair Value |  |
Fair value - Within 1 year | 5,594,638 | 3,560,360
Fair value - After 1 to 5 years | 4,285,410 | 4,462,175
Fair value - After 5 to 10 years | 624,240 | 249,661
Fair Value | $ 10,504,288 | $ 8,272,196
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.88% | 2.10%
Weighted average yield - After 1 to 5 years | 2.34% | 2.25%
Weighted average yield - After 5 to 10 years | 1.60% | 2.84%
Weighted Average Yield | 2.05% | 2.21%
Obligations of U.S. Government sponsored entities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 127,485 | $ 212,951
Amortized cost - After 1 to 5 years | 60,005 | 123,857
Amortized Cost | 187,490 | 336,808
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 6 | 0
Gross unrealized gain - After 1 to 5 years | 1 | 1
Gross unrealized gains | 7 | 1
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 174 | 1,406
Gross unrealized losses - After 1 to 5 years | 231 | 2,094
Gross unrealized losses | 405 | 3,500
Fair Value |  |
Fair value - Within 1 year | 127,317 | 211,545
Fair value - After 1 to 5 years | 59,775 | 121,764
Fair Value | $ 187,092 | $ 333,309
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.40% | 1.44%
Weighted average yield - After 1 to 5 years | 1.48% | 1.51%
Weighted Average Yield | 1.43% | 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 | 44 |
Gross unrealized losses - After 1 to 5 years |  | 184
Gross unrealized losses | 44 | 184
Fair Value |  |
Fair value - Within 1 year | 6,931 |
Fair value - After 1 to 5 years |  | 6,742
Fair Value | $ 6,931 | $ 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 - After 1 to 5 years | $ 725 | $ 749
Amortized cost - After 5 to 10 years | 91,024 | 115,744
Amortized cost - After 10 years | 541,407 | 638,995
Amortized Cost | 633,156 | 755,488
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 0 | 0
Gross unrealized gain - After 5 to 10 years | 32 | 1
Gross unrealized gain - After 10 years | 4,410 | 1,584
Gross unrealized gains | 4,442 | 1,585
Gross unrealized loss |  |
Gross unrealized losses - After 1 to 5 years | 1 | 7
Gross unrealized losses - After 5 to 10 years | 1,210 | 4,715
Gross unrealized losses - After 10 years | 5,751 | 23,680
Gross unrealized losses | 6,962 | 28,402
Fair Value |  |
Fair value - After 1 to 5 years | 724 | 742
Fair value - After 5 to 10 years | 89,846 | 111,030
Fair value - After 10 years | 540,066 | 616,899
Fair Value | $ 630,636 | $ 728,671
Weighted average yield |  |
Weighted average yield - After 1 to 5 years | 2.02% | 1.92%
Weighted average yield - After 5 to 10 years | 1.64% | 1.71%
Weighted average yield - After 10 years | 2.09% | 2.10%
Weighted Average Yield | 2.02% | 2.04%
Mortgage Backed Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 37 | $ 431
Amortized cost - After 1 to 5 years | 39,627 | 6,762
Amortized cost - After 5 to 10 years | 315,038 | 365,727
Amortized cost - After 10 years | 4,751,236 | 3,710,731
Amortized Cost | 5,105,938 | 4,083,651
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 0 | 4
Gross unrealized gain - After 1 to 5 years | 861 | 43
Gross unrealized gain - After 5 to 10 years | 2,623 | 1,090
Gross unrealized gain - After 10 years | 64,743 | 10,679
Gross unrealized gains | 68,227 | 11,816
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 0 | 0
Gross unrealized losses - After 1 to 5 years | 2 | 1
Gross unrealized losses - After 5 to 10 years | 1,391 | 8,499
Gross unrealized losses - After 10 years | 22,982 | 128,189
Gross unrealized losses | 24,375 | 136,689
Fair Value |  |
Fair value - Within 1 year | 37 | 435
Fair value - After 1 to 5 years | 40,486 | 6,804
Fair value - After 5 to 10 years | 316,270 | 358,318
Fair value - After 10 years | 4,792,997 | 3,593,221
Fair Value | $ 5,149,790 | $ 3,958,778
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.05% | 4.30%
Weighted average yield - After 1 to 5 years | 3.35% | 2.74%
Weighted average yield - After 5 to 10 years | 2.04% | 2.19%
Weighted average yield - After 10 years | 2.61% | 2.45%
Weighted Average Yield | 2.58% | 2.43%
Other |  |
Amortized cost |  |
Amortized cost - After 1 to 5 years | $ 364 |
Amortized cost - After 5 to 10 years |  | $ 486
Amortized Cost | 364 | 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 | 373 |
Fair value - After 5 to 10 years |  | 488
Fair Value | $ 373 | $ 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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