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INVESTMENT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Less than 12 months | $ 3,095 | $ 64,559
Unrealized Losses Less than 12 months | 1 | 331
Fair Value 12 months or more | 777,105 | 1,328,036
Unrealized Losses 12 months or more | 14,226 | 39,591
Total Fair Value | 780,200 | 1,392,595
Total Unrealized Losses | 14,227 | 39,922
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 | 2,899 | 2,824
Unrealized Losses 12 months or more | 1,399 | 1,361
Total Fair Value | 2,899 | 2,824
Total Unrealized Losses | 1,399 | 1,361
US Treasury and Government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Less than 12 months | 0 | 16,669
Unrealized Losses Less than 12 months | 0 | 77
Fair Value 12 months or more | 293,853 | 468,094
Unrealized Losses 12 months or more | 1,023 | 6,004
Total Fair Value | 293,853 | 484,763
Total Unrealized Losses | 1,023 | 6,081
Mortgage Backed Securities [Member] | FNMA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Less than 12 months | 0 | 25,079
Unrealized Losses Less than 12 months | 0 | 129
Fair Value 12 months or more | 321,593 | 521,871
Unrealized Losses 12 months or more | 4,393 | 17,048
Total Fair Value | 321,593 | 546,950
Total Unrealized Losses | 4,393 | 17,177
Mortgage Backed Securities [Member] | FHLMC [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Less than 12 months | 0 | 3,382
Unrealized Losses Less than 12 months | 0 | 32
Fair Value 12 months or more | 116,615 | 263,798
Unrealized Losses 12 months or more | 1,832 | 8,517
Total Fair Value | 116,615 | 267,180
Total Unrealized Losses | 1,832 | 8,549
Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Less than 12 months | 0 | 3,364
Unrealized Losses Less than 12 months | 0 | 15
Fair Value 12 months or more | 29,638 | 57,535
Unrealized Losses 12 months or more | 222 | 1,235
Total Fair Value | 29,638 | 60,899
Total Unrealized Losses | 222 | 1,250
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 | 3,095 | 16,065
Unrealized Losses Less than 12 months | 1 | 78
Fair Value 12 months or more | 0 | 0
Unrealized Losses 12 months or more | 0 | 0
Total Fair Value | 3,095 | 16,065
Total Unrealized Losses | 1 | 78
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 | 12,507 | 13,914
Unrealized Losses 12 months or more | 5,357 | 5,426
Total Fair Value | 12,507 | 13,914
Total Unrealized Losses | $ 5,357 | $ 5,426

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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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