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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Investment Securities Available for Sale [Table Text Block] |
|  |  | December 31, 2017
|  |  | Amortized cost |  | Noncredit Loss Component of OTTI Recorded in OCI |  | Gross |  | Fair value |  |
|  |  |  | Unrealized |  |  | Weighted-
|  |  |  |  | Gains |  | Losses |  |  | average yield%
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  | $ | 7,458 |  | $ | - |  | $ | - |  | $ | 57 |  | $ | 7,401 |  | 1.29
Obligations of U.S. government-sponsored |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year |  |  | 122,471 |  |  | - |  |  | - |  |  | 319 |  |  | 122,152 |  | 1.06
| After 1 to 5 years |  |  | 309,472 |  |  | - |  |  | 28 |  |  | 3,735 |  |  | 305,765 |  | 1.42
| After 5 to 10 years |  |  | 133,451 |  |  | - |  |  | 117 |  |  | 319 |  |  | 133,249 |  | 2.72
| After 10 years |  |  | 40,769 |  |  | - |  |  | 1 |  |  | 149 |  |  | 40,621 |  | 1.84
Puerto Rico government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 5 to 10 years |  |  | 4,071 |  |  | - |  |  | 47 |  |  | - |  |  | 4,118 |  | 3.14
| After 10 years |  |  | 3,972 |  |  | - |  |  | - |  |  | 1,277 |  |  | 2,695 |  | 6.97
United States and Puerto |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rico government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
obligations |  |  | 621,664 |  |  | - |  |  | 193 |  |  | 5,856 |  |  | 616,001 |  | 1.70
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FHLMC certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 5 to 10 years |  |  | 18,658 |  |  | - |  |  | 14 |  |  | 63 |  |  | 18,609 |  | 2.14
| After 10 years |  |  | 297,733 |  |  | - |  |  | 217 |  |  | 4,853 |  |  | 293,097 |  | 2.23
|  |  |  | 316,391 |  |  | - |  |  | 231 |  |  | 4,916 |  |  | 311,706 |  | 2.23
GNMA certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  |  | 81 |  |  | - |  |  | 1 |  |  | - |  |  | 82 |  | 3.23
| After 5 to 10 years |  |  | 69,661 |  |  | - |  |  | 1,244 |  |  | - |  |  | 70,905 |  | 3.05
| After 10 years |  |  | 145,067 |  |  | - |  |  | 5,910 |  |  | 334 |  |  | 150,643 |  | 3.81
|  |  |  | 214,809 |  |  | - |  |  | 7,155 |  |  | 334 |  |  | 221,630 |  | 3.56
FNMA certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  |  | 20,831 |  |  | - |  |  | 294 |  |  | 109 |  |  | 21,016 |  | 2.69
| After 5 to 10 years |  |  | 49,934 |  |  | - |  |  | - |  |  | 818 |  |  | 49,116 |  | 1.83
| After 10 years |  |  | 613,129 |  |  | - |  |  | 3,180 |  |  | 6,401 |  |  | 609,908 |  | 2.43
|  |  |  | 683,894 |  |  | - |  |  | 3,474 |  |  | 7,328 |  |  | 680,040 |  | 2.39
Collateralized mortgage obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| guaranteed by the FHLMC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| and GNMA: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  |  | 5,918 |  |  | - |  |  | 14 |  |  | - |  |  | 5,932 |  | 2.21
| After 5 to 10 years |  |  | 2,556 |  |  | - |  |  | 11 |  |  | - |  |  | 2,567 |  | 2.23
| After 10 years |  |  | 35,331 |  |  | - |  |  | 231 |  |  | - |  |  | 35,562 |  | 2.22
|  |  |  | 43,805 |  |  | - |  |  | 256 |  |  | - |  |  | 44,061 |  | 2.22
Other mortgage pass-through |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
trust certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 10 years |  |  | 22,791 |  |  | 5,731 |  |  | - |  |  | - |  |  | 17,060 |  | 2.44
Total mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
securities |  |  | 1,281,690 |  |  | 5,731 |  |  | 11,116 |  |  | 12,578 |  |  | 1,274,497 |  | 2.54
Other : |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year |  |  | 100 |  |  | - |  |  | - |  |  | - |  |  | 100 |  | 1.48
Equity securities (1) |  |  | 424 |  |  | - |  |  | - |  |  | 6 |  |  | 418 |  | 2.11
Total investment securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| available for sale |  | $ | 1,903,878 |  | $ | 5,731 |  | $ | 11,309 |  | $ | 18,440 |  | $ | 1,891,016 |  | 2.27
(1) Equity securities consisted of investment in a Community Reinvestment Act Qualified Investment Fund.
|  |  | December 31, 2016
|  |  | Amortized cost |  | Noncredit Loss Component of OTTI Recorded in OCI |  | Gross |  | Fair value |  |
|  |  |  | Unrealized |  |  | Weighted-
|  |  |  |  | Gains |  | Losses |  |  | average yield%
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year |  | $ | 7,508 |  | $ | - |  | $ | 1 |  | $ | - |  | $ | 7,509 |  | 0.57
Obligations of U.S. government-sponsored |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  |  | 440,438 |  |  | - |  |  | 142 |  |  | 2,912 |  |  | 437,668 |  | 1.33
| After 5 to 10 years |  |  | 16,942 |  |  | - |  |  | 9 |  |  | 256 |  |  | 16,695 |  | 1.91
| After 10 years |  |  | 44,145 |  |  | - |  |  | 8 |  |  | 166 |  |  | 43,987 |  | 1.12
Puerto Rico government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  |  | 21,422 |  |  | 12,222 |  |  | - |  |  | - |  |  | 9,200 |  | -
| After 10 years |  |  | 21,245 |  |  | 2,028 |  |  | 73 |  |  | 1,662 |  |  | 17,628 |  | 1.86
United States and Puerto Rico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
government obligations |  |  | 551,700 |  |  | 14,250 |  |  | 233 |  |  | 4,996 |  |  | 532,687 |  | 1.29
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FHLMC certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 5 to 10 years |  |  | 5,908 |  |  | - |  |  | 72 |  |  | - |  |  | 5,980 |  | 2.25
| After 10 years |  |  | 314,906 |  |  | - |  |  | 261 |  |  | 5,827 |  |  | 309,340 |  | 2.17
|  |  |  | 320,814 |  |  | - |  |  | 333 |  |  | 5,827 |  |  | 315,320 |  | 2.17
GNMA certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  |  | 83 |  |  | - |  |  | 3 |  |  | - |  |  | 86 |  | 3.82
| After 5 to 10 years |  |  | 91,744 |  |  | - |  |  | 1,635 |  |  | 92 |  |  | 93,287 |  | 3.06
| After 10 years |  |  | 123,548 |  |  | - |  |  | 9,706 |  |  | - |  |  | 133,254 |  | 4.36
|  |  |  | 215,375 |  |  | - |  |  | 11,344 |  |  | 92 |  |  | 226,627 |  | 3.81
FNMA certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year |  |  | 152 |  |  | - |  |  | 2 |  |  | - |  |  | 154 |  | 4.71
| After 1 to 5 years |  |  | 24,409 |  |  | - |  |  | 435 |  |  | - |  |  | 24,844 |  | 2.18
| After 5 to 10 years |  |  | 17,181 |  |  | - |  |  | - |  |  | 261 |  |  | 16,920 |  | 1.87
| After 10 years |  |  | 690,625 |  |  | - |  |  | 4,136 |  |  | 9,406 |  |  | 685,355 |  | 2.35
|  |  |  | 732,367 |  |  | - |  |  | 4,573 |  |  | 9,667 |  |  | 727,273 |  | 2.33
Collateralized mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| obligations issued or guaranteed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| by the FHLMC and GNMA: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  |  | 19,851 |  |  | - |  |  | 4 |  |  | 31 |  |  | 19,824 |  | 1.42
| After 10 years |  |  | 39,120 |  |  | - |  |  | - |  |  | 132 |  |  | 38,988 |  | 1.44
|  |  |  | 58,971 |  |  | - |  |  | 4 |  |  | 163 |  |  | 58,812 |  | 1.43
Other mortgage pass-through |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
trust certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 10 years |  |  | 28,815 |  |  | 8,122 |  |  | - |  |  | - |  |  | 20,693 |  | 2.40
Total mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
securities |  |  | 1,356,342 |  |  | 8,122 |  |  | 16,254 |  |  | 15,749 |  |  | 1,348,725 |  | 2.49
Other: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  |  | 100 |  |  | - |  |  | - |  |  | - |  |  | 100 |  | 1.50
Equity Securities (1) |  |  | 415 |  |  | - |  |  | - |  |  | 7 |  |  | 408 |  | 2.44
Total investment securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| available for sale |  | $ | 1,908,557 |  | $ | 22,372 |  | $ | 16,487 |  | $ | 20,752 |  | $ | 1,881,920 |  | 2.14
(1) Equity securities consisted of investment in a Community Reinvestment Act Qualified Investment Fund.
Available-for-Sale Investments' Fair Value and Gross Unrealized Losses [Table Text Block] |
| As of December 31, 2017
| Less than 12 months |  | 12 months or more |  | Total
|  |  | Unrealized |  |  |  | Unrealized |  |  |  | Unrealized
| Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
(In thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico government obligations | $ | - |  | $ | - |  | $ | 2,695 |  | $ | 1,277 |  | $ | 2,695 |  | $ | 1,277
U.S Treasury and U.S. government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
agencies obligations |  | 136,459 |  |  | 494 |  |  | 362,050 |  |  | 4,085 |  |  | 498,509 |  |  | 4,579
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FNMA |  | 189,699 |  |  | 1,705 |  |  | 274,963 |  |  | 5,623 |  |  | 464,662 |  |  | 7,328
FHLMC |  | 91,174 |  |  | 590 |  |  | 166,331 |  |  | 4,326 |  |  | 257,505 |  |  | 4,916
GNMA |  | 39,145 |  |  | 334 |  |  | - |  |  | - |  |  | 39,145 |  |  | 334
Other mortgage pass-through trust certificates |  | - |  |  | - |  |  | 17,060 |  |  | 5,731 |  |  | 17,060 |  |  | 5,731
Equity securities |  | - |  |  | - |  |  | 407 |  |  | 6 |  |  | 407 |  |  | 6
| $ | 456,477 |  | $ | 3,123 |  | $ | 823,506 |  | $ | 21,048 |  | $ | 1,279,983 |  | $ | 24,171
| As of December 31, 2016
| Less than 12 months |  | 12 months or more |  | Total
|  |  | Unrealized |  |  |  | Unrealized |  |  |  | Unrealized
| Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
(In thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico government obligations | $ | - |  | $ | - |  | $ | 22,609 |  | $ | 15,912 |  | $ | 22,609 |  | $ | 15,912
U.S Treasury and U.S. government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
agencies obligations |  | 469,046 |  |  | 3,334 |  |  | - |  |  | - |  |  | 469,046 |  |  | 3,334
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FNMA |  | 519,008 |  |  | 9,667 |  |  | - |  |  | - |  |  | 519,008 |  |  | 9,667
FHLMC |  | 244,839 |  |  | 5,827 |  |  | - |  |  | - |  |  | 244,839 |  |  | 5,827
GNMA |  | 43,388 |  |  | 92 |  |  | - |  |  | - |  |  | 43,388 |  |  | 92
Collateralized mortgage obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
issued or guaranteed by FHLMC and GNMA |  | 55,309 |  |  | 163 |  |  | - |  |  | - |  |  | 55,309 |  |  | 163
Other mortgage pass-through trust certificates |  | - |  |  | - |  |  | 20,693 |  |  | 8,122 |  |  | 20,693 |  |  | 8,122
Equity securities |  | 408 |  |  | 7 |  |  | - |  |  | - |  |  | 408 |  |  | 7
| $ | 1,331,998 |  | $ | 19,090 |  | $ | 43,302 |  | $ | 24,034 |  | $ | 1,375,300 |  | $ | 43,124
OTTI Losses on Available-for-Sale Debt Securities [Table Text Block] |
|  |  |  | Year Ended
|  |  |  | 2017 |  | 2016 |  |  | 2015
(In thousands) |  |  |  |  |  |  |  |  |  |
Total other-than-temporary impairment losses |  |  | $ | (12,231) |  | $ | (1,845) |  | $ | (35,806)
Portion of other-than-temporary impairment recognized in OCI |  |  |  | - |  |  | (4,842) |  |  | 19,289
Net impairment losses recognized in earnings (1) |  |  | $ | (12,231) |  | $ | (6,687) |  | $ | (16,517)
(1) | For the years ended December 31, 2017, 2016 and 2015, approximately $12.2 million, $6.3 million and $15.9 million, respectively, of the credit impairment recognized in earnings consisted of credit losses on Puerto Rico government debt securities that were sold in the second quarter of 2017, as further discussed below. The remaining impairment losses for the years ended December 31, 2016 and 2015 were associated with credit losses on private label MBS.
Roll-Forward of Credit Losses on Debt Securities Held by Corporation [Table Text Block] |
The following tables summarize the roll-forward of credit losses on debt securities held by the Corporation for which a portion of an OTTI is recognized in OCI: |
|  | Cumulative OTTI credit losses recognized in earnings on securities still held |
|  |  |  |  | Credit impairments |  | Credit impairments |  |  | Credit loss |  |  |
|  | December 31, |  | recognized in earnings |  | recognized in earnings on |  |  | reductions for |  | December 31, |
|  | 2016 |  | on securities not |  | securities that have been |  |  | securities sold |  | 2017 |
|  | Balance |  | previously impaired |  | previously impaired |  |  | during the period |  | Balance |
(In thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico government obligations | $ | 22,189 |  | $ | - |  | $ | 12,231 |  |  | $ | (34,420) |  | $ | - |
Private label MBS |  | 6,792 |  |  | - |  |  | - |  |  |  | - |  |  | 6,792 |
Total OTTI credit losses for available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
debt securities | $ | 28,981 |  | $ | - |  | $ | 12,231 |  |  | $ | (34,420) |  | $ | 6,792 |
|  |  | Cumulative OTTI credit losses recognized in earnings on securities still held |
|  |  |  |  |  |  | Credit impairments |  |  | Credit impairments |  |  |
|  |  | December 31, |  |  | recognized in earnings |  |  | recognized in earnings on |  | December 31, |
|  |  | 2015 |  |  | on securities not |  |  | securities that have been |  | 2016 |
|  |  | Balance |  |  | previously impaired |  |  | previously impaired |  | Balance |
(In thousands) |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico government obligations |  | $ | 15,889 |  | $ | - |  | $ | 6,300 |  | $ | 22,189 |
Private label MBS |  |  | 6,405 |  |  | - |  |  | 387 |  |  | 6,792 |
Total OTTI credit losses for available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
debt securities |  | $ | 22,294 |  | $ | - |  | $ | 6,687 |  | $ | 28,981 |
|  | Cumulative OTTI credit losses recognized in earnings on securities still held |
|  |  |  |  | Credit impairments |  | Credit impairments |  |  |
|  | December 31, |  | recognized in earnings |  | recognized in earnings on |  | December 31, |
|  | 2014 |  | on securities not |  | securities that have been |  | 2015 |
|  | Balance |  | previously impaired |  | previously impaired |  | Balance |
(In thousands) |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |
| Puerto Rico government obligations | $ | - |  | $ | 15,889 |  |  | - |  | $ | 15,889 |
Private label MBS |  | 5,777 |  |  | - |  | $ | 628 |  |  | 6,405 |
Total OTTI credit losses for available-for-sale |  |  |  |  |  |  |  |  |  |  |  |
debt securities | $ | 5,777 |  | $ | 15,889 |  | $ | 628 |  | $ | 22,294 |
Significant Assumptions in Valuation of Private Label MBS [Table Text Block] |
| As of |  | As of
| December 31, 2017 |  | December 31, 2016
| Weighted |  |  |  | Weighted |  |
| Average |  | Range |  | Average |  | Range
Discount rate | 14.0% |  | 14.0% |  | 14.1% |  | 12.88% - 14.43%
Prepayment rate | 16.4% |  | 12.0% - 29.0% |  | 13.8% |  | 6.5% - 22.5%
Projected Cumulative Loss Rate | 3% |  | 0% - 6.8% |  | 4% |  | 0.2% - 8.6%
Schedule of aggregate amortized cost and approximate market value of investment securities available for sale [Table Text Block] |
The aggregate amortized cost and approximate market value of investment securities available for sale as of December 31, 2017 by contractual maturity, are shown below:
| Amortized Cost |  | Fair Value
(Dollars in thousands) |  |  |  |  |
Within 1 year | $ | 122,571 |  | $ | 122,252
After 1 to 5 years |  | 343,760 |  |  | 340,196
After 5 to 10 years |  | 278,331 |  |  | 278,564
After 10 years |  | 1,158,792 |  |  | 1,149,586
Total | $ | 1,903,454 |  | $ | 1,890,598
Equity securities |  | 424 |  |  | 418
Total investment securities available for sale | $ | 1,903,878 |  | $ | 1,891,016
Schedule of Available-for-sale Securities by issuer type [Table Text Block] |
|  |  | As of |  |  | As of
|  | December 31, 2017 |  | December 31, 2016
|  | Amortized |  |  |  |  | Amortized |  |
|  | Cost |  | Fair Value |  | Cost |  | Fair Value
(In thousands) |  |  |  |  |  |  |  |
FHLMC |  | $ | 375,719 |  | $ | 370,855 |  | $ | 399,955 |  | $ | 394,249
GNMA |  |  | 250,140 |  |  | 257,192 |  |  | 254,495 |  |  | 265,615
FNMA |  |  | 801,198 |  |  | 796,726 |  |  | 849,584 |  |  | 843,818
FHLB |  |  | 299,949 |  |  | 296,767 |  |  | 231,666 |  |  | 229,792
Held to maturity Securities [Member] |
Available-for-Sale Investments' Fair Value and Gross Unrealized Losses [Table Text Block] |
| As of December 31, 2017
| Less than 12 months |  | 12 months or more |  | Total
|  |  | Unrealized |  |  |  | Unrealized |  |  |  | Unrealized
| Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
|  | (In thousands)
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico Municipal Bonds | $ | - |  | $ | - |  | $ | 131,032 |  | $ | 19,595 |  | $ | 131,032 |  | $ | 19,595
| As of December 31, 2016
| Less than 12 months |  | 12 months or more |  | Total
|  |  | Unrealized |  |  |  | Unrealized |  |  |  | Unrealized
| Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
|  | (In thousands)
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico Municipal Bonds | $ | - |  | $ | - |  | $ | 132,759 |  | $ | 23,431 |  | $ | 132,759 |  | $ | 23,431
Held To Maturity Securities [Text Block] |
|  | December 31, 2017
|  | Amortized cost |  |  |  |  | Fair value |  |
|  |  |  | Gross Unrealized |  |  | Weighted-
|  |  |  | gains |  | losses |  |  | average yield%
Puerto Rico Municipal Bonds: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years | $ | 3,853 |  |  | $ | - |  | $ | 173 |  | $ | 3,680 |  | 5.38
| After 5 to 10 years |  | 39,523 |  |  |  | - |  |  | 3,048 |  |  | 36,475 |  | 5.28
| After 10 years |  | 107,251 |  |  |  | - |  |  | 16,374 |  |  | 90,877 |  | 4.93
Total investment securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
| held to maturity | $ | 150,627 |  |  | $ | - |  | $ | 19,595 |  | $ | 131,032 |  | 5.03
|  | December 31, 2016
|  | Amortized cost |  |  |  | Fair value |  |
|  |  | Gross Unrealized |  |  | Weighted-
|  |  | gains |  | losses |  |  | average yield%
Puerto Rico Municipal Bonds: |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years | $ | 1,136 |  | $ | - |  | $ | 20 |  | $ | 1,116 |  | 5.38
| After 5 to 10 years |  | 10,741 |  |  | - |  |  | 718 |  |  | 10,023 |  | 4.47
| After 10 years |  | 144,313 |  |  | - |  |  | 22,693 |  |  | 121,620 |  | 4.74
Total investment securities |  |  |  |  |  |  |  |  |  |  |  |  |
| held to maturity | $ | 156,190 |  | $ | - |  | $ | 23,431 |  | $ | 132,759 |  | 4.73

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