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INVESTMENT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Less than 12 months | $ 5,068,253 | $ 782,960
Unrealized Losses Less than 12 months | 61,848 | 1,610
Fair Value 12 months or more | 89,702 | 44,465
Unrealized Losses 12 months or more | 3,743 | 3,907
Total Fair Value | 5,157,955 | 827,425
Total Unrealized Losses | 65,591 | 5,517
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 | 2,894 | 2,899
Unrealized Losses 12 months or more | 478 | 780
Total Fair Value | 2,894 | 2,899
Total Unrealized Losses | 478 | 780
U.S. Treasury and U.S. government agencies obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Less than 12 months | 2,018,246 | 425,155
Unrealized Losses Less than 12 months | 15,805 | 621
Fair Value 12 months or more | 47,550 | 23,377
Unrealized Losses 12 months or more | 263 | 165
Total Fair Value | 2,065,796 | 448,532
Total Unrealized Losses | 16,068 | 786
Mortgage Backed Securities [Member] | FNMA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Less than 12 months | 1,384,133 | 93,509
Unrealized Losses Less than 12 months | 18,063 | 203
Fair Value 12 months or more | 10,582 | 0
Unrealized Losses 12 months or more | 319 | 0
Total Fair Value | 1,394,715 | 93,509
Total Unrealized Losses | 18,382 | 203
Mortgage Backed Securities [Member] | FHLMC [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Less than 12 months | 1,130,514 | 89,292
Unrealized Losses Less than 12 months | 20,355 | 159
Fair Value 12 months or more | 0 | 0
Unrealized Losses 12 months or more | 0 | 0
Total Fair Value | 1,130,514 | 89,292
Total Unrealized Losses | 20,355 | 159
Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Less than 12 months | 108,272 | 70,504
Unrealized Losses Less than 12 months | 1,573 | 217
Fair Value 12 months or more | 0 | 0
Unrealized Losses 12 months or more | 0 | 0
Total Fair Value | 108,272 | 70,504
Total Unrealized Losses | 1,573 | 217
Mortgage Backed Securities [Member] | Collateralized mortgage obligations guaranteed by the FHLMC, FNMA and GNMA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Less than 12 months | 427,088 | 104,500
Unrealized Losses Less than 12 months | 6,052 | 410
Fair Value 12 months or more | 21,102 | 9,761
Unrealized Losses 12 months or more | 397 | 82
Total Fair Value | 448,190 | 114,261
Total Unrealized Losses | 6,449 | 492
Mortgage Backed Securities [Member] | Private label [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 | 7,574 | 8,428
Unrealized Losses 12 months or more | 2,286 | 2,880
Total Fair Value | 7,574 | 8,428
Total Unrealized Losses | $ 2,286 | $ 2,880

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