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INTEREST AND DIVIDEND ON INVESTMENTS (Tables)

12 Months Ended

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