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DEBT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | $ 50,104 |  | $ 26,180 |  |  |
Unrealized Losses Less than 12 months | 665 |  | 120 |  |  |
Fair Value 12 months or more | 4,875,876 |  | 5,170,265 |  |  |
Unrealized Losses 12 months or more | 636,825 |  | 632,929 |  |  |
Total Fair Value | 4,925,980 |  | 5,196,445 |  |  |
Total Unrealized Losses | 637,490 |  | 633,049 |  |  |
Allowance for Credit Losses | 549 | $ 442 | 511 | $ 433 | $ 449 | $ 458
U.S. Treasury and U.S. government agencies obligations [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 875 |  | 2,544 |  |  |
Unrealized Losses Less than 12 months | 0 |  | 2 |  |  |
Fair Value 12 months or more | 2,338,381 |  | 2,428,784 |  |  |
Unrealized Losses 12 months or more | 132,562 |  | 157,026 |  |  |
Total Fair Value | 2,339,256 |  | 2,431,328 |  |  |
Total Unrealized Losses | 132,562 |  | 157,028 |  |  |
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 | 1,532 |  | 1,415 |  |  |
Unrealized Losses 12 months or more | 1,166 |  | 1,346 |  |  |
Total Fair Value | 1,532 |  | 1,415 |  |  |
Total Unrealized Losses | 1,166 |  | 1,346 |  |  |
Allowance for Credit Losses | 386 | 326 | 395 | 350 | 366 | 375
Residential MBS [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Allowance for Credit Losses | 163 |  | 116 |  |  |
Residential MBS [Member] | Private label [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Allowance for Credit Losses | 163 |  | 100 |  |  |
Residential MBS [Member] | FHLMC [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 1,191 |  | 9 |  |  |
Unrealized Losses Less than 12 months | 15 |  | 0 |  |  |
Fair Value 12 months or more | 915,156 |  | 988,092 |  |  |
Unrealized Losses 12 months or more | 186,218 |  | 174,786 |  |  |
Total Fair Value | 916,347 |  | 988,101 |  |  |
Total Unrealized Losses | 186,233 |  | 174,786 |  |  |
Residential MBS [Member] | GNMA [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 11,188 |  | 12,257 |  |  |
Unrealized Losses Less than 12 months | 123 |  | 100 |  |  |
Fair Value 12 months or more | 188,231 |  | 202,390 |  |  |
Unrealized Losses 12 months or more | 29,282 |  | 25,808 |  |  |
Total Fair Value | 199,419 |  | 214,647 |  |  |
Total Unrealized Losses | 29,405 |  | 25,908 |  |  |
Residential MBS [Member] | FNMA [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 8,135 |  | 0 |  |  |
Unrealized Losses Less than 12 months | 99 |  | 0 |  |  |
Fair Value 12 months or more | 1,088,394 |  | 1,183,275 |  |  |
Unrealized Losses 12 months or more | 190,017 |  | 180,913 |  |  |
Total Fair Value | 1,096,529 |  | 1,183,275 |  |  |
Total Unrealized Losses | 190,116 |  | 180,913 |  |  |
Residential MBS [Member] | CMOs issued or guaranteed by the FHLMC, FNMA, and GNMA: [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 | 202,963 |  | 221,276 |  |  |
Unrealized Losses 12 months or more | 54,810 |  | 52,263 |  |  |
Total Fair Value | 202,963 |  | 221,276 |  |  |
Total Unrealized Losses | 54,810 |  | 52,263 |  |  |
Residential 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 | 4,567 |  | 4,785 |  |  |
Unrealized Losses 12 months or more | 1,951 |  | 2,185 |  |  |
Total Fair Value | 4,567 |  | 4,785 |  |  |
Total Unrealized Losses | 1,951 |  | 2,185 |  |  |
Allowance for Credit Losses | 163 | $ 116 | 116 | $ 83 | $ 83 | $ 83
Commercial MBS [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 28,715 |  | 11,370 |  |  |
Unrealized Losses Less than 12 months | 428 |  | 18 |  |  |
Fair Value 12 months or more | 136,652 |  | 140,248 |  |  |
Unrealized Losses 12 months or more | 40,819 |  | 38,602 |  |  |
Total Fair Value | 165,367 |  | 151,618 |  |  |
Total Unrealized Losses | 41,247 |  | 38,620 |  |  |
Allowance for Credit Losses | $ 0 |  | $ 0 |  |  |

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