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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
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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

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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