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DEBT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | $ 1,454,491 |  | $ 4,601,661 |  |  |
Unrealized Losses Less than 12 months | 177,467 |  | 76,269 |  |  |
Fair Value 12 months or more | 4,164,395 |  | 1,008,607 |  |  |
Unrealized Losses 12 months or more | 681,262 |  | 32,268 |  |  |
Total Fair Value | 5,618,886 |  | 5,610,268 |  |  |
Total Unrealized Losses | 858,729 |  | 108,537 |  |  |
Allowance for credit losses | 257,859 | $ 252,152 | 269,030 | $ 288,360 | $ 324,958 | $ 385,887
Private label [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Allowance for credit losses | 300 |  | 800 |  |  |
U.S. Treasury and U.S. government agencies obligations [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 379,287 |  | 1,717,340 |  |  |
Unrealized Losses Less than 12 months | 25,696 |  | 25,401 |  |  |
Fair Value 12 months or more | 2,072,728 |  | 606,179 |  |  |
Unrealized Losses 12 months or more | 242,596 |  | 16,243 |  |  |
Total Fair Value | 2,452,015 |  | 2,323,519 |  |  |
Total Unrealized Losses | 268,292 |  | 41,644 |  |  |
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 | 2,193 |  | 2,850 |  |  |
Unrealized Losses 12 months or more | 798 |  | 416 |  |  |
Total Fair Value | 2,193 |  | 2,850 |  |  |
Total Unrealized Losses | 798 |  | 416 |  |  |
Allowance for credit losses | 400 |  | 300 |  |  |
MBS [Member] | FHLMC [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 342,188 |  | 986,345 |  |  |
Unrealized Losses Less than 12 months | 61,298 |  | 16,144 |  |  |
Fair Value 12 months or more | 772,815 |  | 221,896 |  |  |
Unrealized Losses 12 months or more | 161,909 |  | 8,481 |  |  |
Total Fair Value | 1,115,003 |  | 1,208,241 |  |  |
Total Unrealized Losses | 223,207 |  | 24,625 |  |  |
MBS [Member] | GNMA [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 177,448 |  | 194,271 |  |  |
Unrealized Losses Less than 12 months | 15,418 |  | 1,329 |  |  |
Fair Value 12 months or more | 91,617 |  | 41,233 |  |  |
Unrealized Losses 12 months or more | 20,081 |  | 984 |  |  |
Total Fair Value | 269,065 |  | 235,504 |  |  |
Total Unrealized Losses | 35,499 |  | 2,313 |  |  |
MBS [Member] | FNMA [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 484,050 |  | 1,237,701 |  |  |
Unrealized Losses Less than 12 months | 65,795 |  | 19,843 |  |  |
Fair Value 12 months or more | 907,828 |  | 112,559 |  |  |
Unrealized Losses 12 months or more | 180,146 |  | 3,821 |  |  |
Total Fair Value | 1,391,878 |  | 1,350,260 |  |  |
Total Unrealized Losses | 245,941 |  | 23,664 |  |  |
MBS [Member] | Collateralized mortgage obligations guaranteed by FHLMC, FNMA and GNMA [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 71,518 |  | 466,004 |  |  |
Unrealized Losses Less than 12 months | 9,260 |  | 13,552 |  |  |
Fair Value 12 months or more | 311,044 |  | 16,656 |  |  |
Unrealized Losses 12 months or more | 73,581 |  | 360 |  |  |
Total Fair Value | 382,562 |  | 482,660 |  |  |
Total Unrealized Losses | 82,841 |  | 13,912 |  |  |
MBS [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 | 6,170 |  | 7,234 |  |  |
Unrealized Losses 12 months or more | 2,151 |  | 1,963 |  |  |
Total Fair Value | 6,170 |  | 7,234 |  |  |
Total Unrealized Losses | $ 2,151 |  | $ 1,963 |  |  |

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