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INTEREST AND DIVIDEND ON INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2017
Interest and Dividend on Investments [Abstract] |
Schedule of of interest on investments and FHLB dividend income [Table Text Block] |
|  |  | Year Ended December 31,
|  |  | 2017 |  |  | 2016 |  |  | 2015
(In thousands) |  |  |  |  |  |  |  |  |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |
Taxable |  | $ | 9,656 |  | $ | 11,246 |  | $ | 13,520
Exempt |  |  | 24,575 |  |  | 20,921 |  |  | 23,779
|  |  | 34,231 |  |  | 32,167 |  |  | 37,299
PR government obligations, U.S. Treasury securities, and U.S. |  |  |  |  |  |  |  |  |
government agencies: |  |  |  |  |  |  |  |  |
Taxable |  |  | 2,091 |  |  | 4,131 |  |  | 2,628
Exempt |  |  | 12,690 |  |  | 13,145 |  |  | 13,848
|  |  | 14,781 |  |  | 17,276 |  |  | 16,476
Other investment securities (including FHLB dividends) |  |  |  |  |  |  |  |  |
Taxable |  |  | 2,113 |  |  | 1,462 |  |  | 1,075
Total interest income on investment securities |  |  | 51,125 |  |  | 50,905 |  |  | 54,850
Interest on money market instruments: |  |  |  |  |  |  |  |  |
Taxable |  |  | 4,609 |  |  | 2,669 |  |  | 1,490
Exempt |  |  | 5 |  |  | 696 |  |  | 658
Total interest income on money market instruments |  |  | 4,614 |  |  | 3,365 |  |  | 2,148
Total interest and dividend income on investments and money |  |  |  |  |  |  |  |  |
market instruments |  | $ | 55,739 |  | $ | 54,270 |  | $ | 56,998
Schedule of components of interest and dividend income on investments [Table Text Block] |
The following table summarizes the components of interest and dividend income on investments:
|  |  | Year Ended December 31,
|  |  | 2017 |  | 2016 |  | 2015
(In thousands) |  |  |  |  |  |  |  |  |
Interest income on investment securities and money |  |  |  |  |  |  |  |  |
market investments |  | $ | 53,634 |  | $ | 52,816 |  | $ | 55,923
Dividends on FHLB stock |  |  | 2,105 |  |  | 1,454 |  |  | 1,075
Total interest income and dividends on investments |  | $ | 55,739 |  | $ | 54,270 |  | $ | 56,998

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