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INVESTMENT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months $ 843,986 $ 456,477
Unrealized Losses Less than 12 months 16,164 3,123
Fair Value 12 months or more 960,270 823,506
Unrealized Losses 12 months or more 43,838 21,048
Total Fair Value 1,804,256 1,279,983
Total Unrealized Losses 60,002 24,171
Puerto Rico Government obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 0 0
Unrealized Losses Less than 12 months 0 0
Fair Value 12 months or more 2,798 2,695
Unrealized Losses 12 months or more 1,313 1,277
Total Fair Value 2,798 2,695
Total Unrealized Losses 1,313 1,277
US Treasury and Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 251,555 136,459
Unrealized Losses Less than 12 months 5,585 494
Fair Value 12 months or more 366,761 362,050
Unrealized Losses 12 months or more 6,280 4,085
Total Fair Value 618,316 498,509
Total Unrealized Losses 11,865 4,579
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months   0
Unrealized Losses Less than 12 months   0
Fair Value 12 months or more   407
Unrealized Losses 12 months or more   6
Total Fair Value   407
Total Unrealized Losses   6
Mortgage Backed Securities [Member] | FNMA    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 342,334 189,699
Unrealized Losses Less than 12 months 6,489 1,705
Fair Value 12 months or more 369,408 274,963
Unrealized Losses 12 months or more 19,870 5,623
Total Fair Value 711,742 464,662
Total Unrealized Losses 26,359 7,328
Mortgage Backed Securities [Member] | FHLMC    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 183,780 91,174
Unrealized Losses Less than 12 months 3,508 590
Fair Value 12 months or more 173,733 166,331
Unrealized Losses 12 months or more 9,655 4,326
Total Fair Value 357,513 257,505
Total Unrealized Losses 13,163 4,916
Mortgage Backed Securities [Member] | GNMA    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 34,354 39,145
Unrealized Losses Less than 12 months 491 334
Fair Value 12 months or more 32,999 0
Unrealized Losses 12 months or more 1,253 0
Total Fair Value 67,353 39,145
Total Unrealized Losses 1,744 334
Mortgage Backed Securities [Member] | Collateralized mortgage obligations guaranteed by the FHLMC and GNMA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 31,963  
Unrealized Losses Less than 12 months 91  
Fair Value 12 months or more 0  
Unrealized Losses 12 months or more 0  
Total Fair Value 31,963  
Total Unrealized Losses 91  
Mortgage Backed Securities [Member] | Other-mortgage pass-through trust certificates [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 0 0
Unrealized Losses Less than 12 months 0 0
Fair Value 12 months or more 14,571 17,060
Unrealized Losses 12 months or more 5,467 5,731
Total Fair Value 14,571 17,060
Total Unrealized Losses $ 5,467 $ 5,731