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INTEREST AND DIVIDEND ON INVESTMENTS- Interest on investments and FHLB dividend income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Income And Expenses [Line Items]      
Mortgage-backed securities $ 34,231 $ 32,167 $ 37,299
PR Government obligations, U.S. Treasury securities and U.S. Government agencies 14,781 17,276 16,476
Total Intesrest income investment securities 51,125 50,905 54,850
Interest on money market investments 4,614 3,365 2,148
Total interest and dividends on investments 55,739 54,270 56,998
Taxable [Member]      
Other Income And Expenses [Line Items]      
Mortgage-backed securities 9,656 11,246 13,520
PR Government obligations, U.S. Treasury securities and U.S. Government agencies 2,091 4,131 2,628
Other investment securities (including FHLB dividends) 2,113 1,462 1,075
Interest on money market investments 4,609 2,669 1,490
Exempt [Member]      
Other Income And Expenses [Line Items]      
Mortgage-backed securities 24,575 20,921 23,779
PR Government obligations, U.S. Treasury securities and U.S. Government agencies 12,690 13,145 13,848
Interest on money market investments $ 5 $ 696 $ 658