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INVESTMENT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months $ 456,477 $ 1,331,998
Unrealized losses less than 12 months 3,123 19,090
Fair Value 12 months or more 823,506 43,302
Unrealized losses 12 months or more 21,048 24,034
Total Fair Value 1,279,983 1,375,300
Total unrealized losses 24,171 43,124
Equity Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 0 408
Unrealized losses less than 12 months 0 7
Fair Value 12 months or more 407 0
Unrealized losses 12 months or more 6 0
Total Fair Value 407 408
Total unrealized losses 6 7
Debt Securities [Member] | 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 2,695 22,609
Unrealized losses 12 months or more 1,277 15,912
Total Fair Value 2,695 22,609
Total unrealized losses 1,277 15,912
Debt Securities [Member] | US States And Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 136,459 469,046
Unrealized losses less than 12 months 494 3,334
Fair Value 12 months or more 362,050 0
Unrealized losses 12 months or more 4,085 0
Total Fair Value 498,509 469,046
Total unrealized losses 4,579 3,334
Mortgage Backed Securities [Member] | Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months   55,309
Unrealized losses less than 12 months   163
Fair Value 12 months or more   0
Unrealized losses 12 months or more   0
Total Fair Value   55,309
Total unrealized losses   163
Mortgage Backed Securities [Member] | Mortgage Backed Securities Issued By Private Enterprises [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 17,060 20,693
Unrealized losses 12 months or more 5,731 8,122
Total Fair Value 17,060 20,693
Total unrealized losses 5,731 8,122
Mortgage Backed Securities [Member] | Government National Mortgage Association Certificates And Obligations G N M A [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 39,145 43,388
Unrealized losses less than 12 months 334 92
Fair Value 12 months or more 0 0
Unrealized losses 12 months or more 0 0
Total Fair Value 39,145 43,388
Total unrealized losses 334 92
Mortgage Backed Securities [Member] | Federal National Mortgage Association Certificates And Obligations F N M A [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 189,699 519,008
Unrealized losses less than 12 months 1,705 9,667
Fair Value 12 months or more 274,963 0
Unrealized losses 12 months or more 5,623 0
Total Fair Value 464,662 519,008
Total unrealized losses 7,328 9,667
Mortgage Backed Securities [Member] | Federal Home Loan Mortgage Corporation Certificates And Obligations F H L M C [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 91,174 244,839
Unrealized losses less than 12 months 590 5,827
Fair Value 12 months or more 166,331 0
Unrealized losses 12 months or more 4,326 0
Total Fair Value 257,505 244,839
Total unrealized losses $ 4,916 $ 5,827