Schedule of of interest on investments and FHLB dividend income [Table Text Block] | | | | Year Ended December 31, | | | | 2016 | | | 2015 | | | 2014 | (In thousands) | | | | | | | | | | | | | | | | | | | | Mortgage-backed securities: | | | | | | | | | | Taxable | | $ | 11,246 | | $ | 13,520 | | $ | 16,303 | Exempt | | | 20,921 | | | 23,779 | | | 28,606 | | | | 32,167 | | | 37,299 | | | 44,909 | PR government obligations, U.S. Treasury securities, and U.S. | | | | | | | | | | government agencies: | | | | | | | | | | Taxable | | | 4,131 | | | 2,628 | | | 1,357 | Exempt | | | 13,145 | | | 13,848 | | | 12,937 | | | | 17,276 | | | 16,476 | | | 14,294 | Other investment securities (including FHLB dividends) | | | | | | | | | | Taxable | | | 1,462 | | | 1,075 | | | 1,169 | Total interest income on investment securities | | | 50,905 | | | 54,850 | | | 60,372 | | | | | | | | | | | Interest on money market instruments: | | | | | | | | | | Taxable | | | 2,669 | | | 1,490 | | | 1,734 | Exempt | | | 696 | | | 658 | | | 158 | Total interest income on money market instruments | | | 3,365 | | | 2,148 | | | 1,892 | Total interest and dividend income on investments and money | | | | | | | | | | market instruments | | $ | 54,270 | | $ | 56,998 | | $ | 62,264 |
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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, | | | | 2016 | | 2015 | | 2014 | (In thousands) | | | | | | | | | | Interest income on investment securities and money | | | | | | | | | | market investments | | $ | 52,816 | | $ | 55,923 | | $ | 61,095 | Dividends on FHLB stock | | | 1,454 | | | 1,075 | | | 1,169 | | | | | | | | | | | Total interest income and dividends on investments | | $ | 54,270 | | $ | 56,998 | | $ | 62,264 |
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