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Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands | Jun. 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 | $ 16,734,722 | $ 13,300,184
Gross Unrealized Gains | 133,050 | 30,929
Gross Unrealized Losses | 58,990 | 209,307
Amortized Cost | 16,660,662 | 13,478,562
Amortized cost |  |
Amortized Cost | 16,660,662 | 13,478,562
Gross unrealized gains |  |
Gross unrealized gains | 133,050 | 30,929
Gross unrealized loss |  |
Gross unrealized losses | $ 58,990 | $ 209,307
Weighted average yield |  |
Weighted Average Yield | 2.30% | 2.25%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 6,143,915 | $ 3,565,571
Amortized cost - After 1 to 5 years | 4,265,188 | 4,483,741
Amortized cost - After 5 to 10 years | 7,064 | 245,891
Amortized Cost | 10,416,167 | 8,295,203
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 3,097 | 108
Gross unrealized gain - After 1 to 5 years | 76,531 | 13,647
Gross unrealized gain - After 5 to 10 years | 235 | 3,770
Gross unrealized gains | 79,863 | 17,525
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 2,697 | 5,319
Gross unrealized losses - After 1 to 5 years | 1,669 | 35,213
Gross unrealized losses - After 5 to 10 years | 0 | 0
Gross unrealized losses | 4,366 | 40,532
Fair Value |  |
Fair value - Within 1 year | 6,144,315 | 3,560,360
Fair value - After 1 to 5 years | 4,340,050 | 4,462,175
Fair value - After 5 to 10 years | 7,299 | 249,661
Fair Value | $ 10,491,664 | $ 8,272,196
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.08% | 2.10%
Weighted average yield - After 1 to 5 years | 2.34% | 2.25%
Weighted average yield - After 5 to 10 years | 2.41% | 2.84%
Weighted Average Yield | 2.19% | 2.21%
Obligations of U.S. Government sponsored entities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 186,092 | $ 212,951
Amortized cost - After 1 to 5 years | 60,752 | 123,857
Amortized Cost | 246,844 | 336,808
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 1 | 0
Gross unrealized gain - After 1 to 5 years | 2 | 1
Gross unrealized gains | 3 | 1
Gross unrealized loss |  |
Gross unrealized losses - Within 1 year | 527 | 1,406
Gross unrealized losses - After 1 to 5 years | 373 | 2,094
Gross unrealized losses | 900 | 3,500
Fair Value |  |
Fair value - Within 1 year | 185,566 | 211,545
Fair value - After 1 to 5 years | 60,381 | 121,764
Fair Value | $ 245,947 | $ 333,309
Weighted average yield |  |
Weighted average yield - Within 1 year | 1.45% | 1.44%
Weighted average yield - After 1 to 5 years | 1.54% | 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 | 97 |
Gross unrealized losses - After 1 to 5 years |  | 184
Gross unrealized losses | 97 | 184
Fair Value |  |
Fair value - Within 1 year | 6,878 |
Fair value - After 1 to 5 years |  | 6,742
Fair Value | $ 6,878 | $ 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 | $ 902 | $ 749
Amortized cost - After 5 to 10 years | 98,268 | 115,744
Amortized cost - After 10 years | 577,850 | 638,995
Amortized Cost | 677,020 | 755,488
Gross unrealized gains |  |
Gross unrealized gain - After 1 to 5 years | 1 | 0
Gross unrealized gain - After 5 to 10 years | 22 | 1
Gross unrealized gain - After 10 years | 4,278 | 1,584
Gross unrealized gains | 4,301 | 1,585
Gross unrealized loss |  |
Gross unrealized losses - After 1 to 5 years | 2 | 7
Gross unrealized losses - After 5 to 10 years | 1,851 | 4,715
Gross unrealized losses - After 10 years | 8,300 | 23,680
Gross unrealized losses | 10,153 | 28,402
Fair Value |  |
Fair value - After 1 to 5 years | 901 | 742
Fair value - After 5 to 10 years | 96,439 | 111,030
Fair value - After 10 years | 573,828 | 616,899
Fair Value | $ 671,168 | $ 728,671
Weighted average yield |  |
Weighted average yield - After 1 to 5 years | 2.01% | 1.92%
Weighted average yield - After 5 to 10 years | 1.66% | 1.71%
Weighted average yield - After 10 years | 2.10% | 2.10%
Weighted Average Yield | 2.04% | 2.04%
Mortgage Backed Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 69 | $ 431
Amortized cost - After 1 to 5 years | 42,319 | 6,762
Amortized cost - After 5 to 10 years | 301,619 | 365,727
Amortized cost - After 10 years | 4,969,253 | 3,710,731
Amortized Cost | 5,313,260 | 4,083,651
Gross unrealized gains |  |
Gross unrealized gain - Within 1 year | 1 | 4
Gross unrealized gain - After 1 to 5 years | 841 | 43
Gross unrealized gain - After 5 to 10 years | 1,755 | 1,090
Gross unrealized gain - After 10 years | 46,278 | 10,679
Gross unrealized gains | 48,875 | 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 | 2,148 | 8,499
Gross unrealized losses - After 10 years | 41,325 | 128,189
Gross unrealized losses | 43,474 | 136,689
Fair Value |  |
Fair value - Within 1 year | 70 | 435
Fair value - After 1 to 5 years | 43,159 | 6,804
Fair value - After 5 to 10 years | 301,226 | 358,318
Fair value - After 10 years | 4,974,206 | 3,593,221
Fair Value | $ 5,318,661 | $ 3,958,778
Weighted average yield |  |
Weighted average yield - Within 1 year | 2.37% | 4.30%
Weighted average yield - After 1 to 5 years | 3.32% | 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 | 2.59% | 2.43%
Other |  |
Amortized cost |  |
Amortized cost - After 5 to 10 years | $ 396 | $ 486
Amortized Cost | 396 | 486
Gross unrealized gains |  |
Gross unrealized gain - After 5 to 10 years | 8 | 2
Gross unrealized gains | 8 | 2
Gross unrealized loss |  |
Gross unrealized losses - After 5 to 10 years | 0 | 0
Gross unrealized losses | 0 | 0
Fair Value |  |
Fair value - After 5 to 10 years | 404 | 488
Fair Value | $ 404 | $ 488
Weighted average yield |  |
Weighted average yield - After 5 to 10 years | 3.62% | 3.62%
Weighted Average Yield | 3.62% | 3.62%

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