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DEBT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Fair Value Less than 12 months | $ 17,006 | $ 26,180 |  |
Unrealized Losses Less than 12 months | 101 | 120 |  |
Fair Value 12 months or more | 4,990,759 | 5,170,265 |  |
Unrealized Losses 12 months or more | 648,036 | 632,929 |  |
Total Fair Value | 5,007,765 | 5,196,445 |  |
Total Unrealized Losses | 648,137 | 633,049 |  |
Allowance for Credit Losses | 442 | 511 | $ 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 | 4,238 | 2,544 |  |
Unrealized Losses Less than 12 months | 5 | 2 |  |
Fair Value 12 months or more | 2,354,777 | 2,428,784 |  |
Unrealized Losses 12 months or more | 151,053 | 157,026 |  |
Total Fair Value | 2,359,015 | 2,431,328 |  |
Total Unrealized Losses | 151,058 | 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 | 1,551 | 1,415 |  |
Unrealized Losses 12 months or more | 1,235 | 1,346 |  |
Total Fair Value | 1,551 | 1,415 |  |
Total Unrealized Losses | 1,235 | 1,346 |  |
Allowance for Credit Losses | 326 | 395 | 366 | 375
Residential MBS [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Allowance for Credit Losses | 116 | 116 |  |
Residential MBS [Member] | Private label [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Allowance for Credit Losses | 100 | 100 |  |
Residential MBS [Member] | FHLMC [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Fair Value Less than 12 months | 7 | 9 |  |
Unrealized Losses Less than 12 months | 0 | 0 |  |
Fair Value 12 months or more | 950,687 | 988,092 |  |
Unrealized Losses 12 months or more | 183,413 | 174,786 |  |
Total Fair Value | 950,694 | 988,101 |  |
Total Unrealized Losses | 183,413 | 174,786 |  |
Residential MBS [Member] | GNMA [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Fair Value Less than 12 months | 3,452 | 12,257 |  |
Unrealized Losses Less than 12 months | 20 | 100 |  |
Fair Value 12 months or more | 195,424 | 202,390 |  |
Unrealized Losses 12 months or more | 28,907 | 25,808 |  |
Total Fair Value | 198,876 | 214,647 |  |
Total Unrealized Losses | 28,927 | 25,908 |  |
Residential MBS [Member] | FNMA [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Fair Value Less than 12 months | 3,963 | 0 |  |
Unrealized Losses Less than 12 months | 11 | 0 |  |
Fair Value 12 months or more | 1,134,624 | 1,183,275 |  |
Unrealized Losses 12 months or more | 187,689 | 180,913 |  |
Total Fair Value | 1,138,587 | 1,183,275 |  |
Total Unrealized Losses | 187,700 | 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 | 211,178 | 221,276 |  |
Unrealized Losses 12 months or more | 53,977 | 52,263 |  |
Total Fair Value | 211,178 | 221,276 |  |
Total Unrealized Losses | 53,977 | 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 | 4,724 | 4,785 |  |
Unrealized Losses 12 months or more | 2,056 | 2,185 |  |
Total Fair Value | 4,724 | 4,785 |  |
Total Unrealized Losses | 2,056 | 2,185 |  |
Allowance for Credit Losses | 116 | 116 | $ 83 | $ 83
Commercial MBS [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Fair Value Less than 12 months | 5,346 | 11,370 |  |
Unrealized Losses Less than 12 months | 65 | 18 |  |
Fair Value 12 months or more | 137,794 | 140,248 |  |
Unrealized Losses 12 months or more | 39,706 | 38,602 |  |
Total Fair Value | 143,140 | 151,618 |  |
Total Unrealized Losses | 39,771 | 38,620 |  |
Allowance for Credit Losses | $ 0 | $ 0 |  |

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