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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

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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