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DEBT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | $ 131,499 |  | $ 1,115,192 |  |  |
Unrealized Losses Less than 12 months | 5,039 |  | 125,343 |  |  |
Fair Value 12 months or more | 5,279,428 |  | 4,447,686 |  |  |
Unrealized Losses 12 months or more | 760,916 |  | 673,123 |  |  |
Total Fair Value | 5,410,927 |  | 5,562,878 |  |  |
Total Unrealized Losses | 765,955 |  | 798,466 |  |  |
Allowance for Credit Losses | 433 | $ 449 | 458 | $ 676 | $ 711 | $ 1,105
U.S. Treasury and U.S. government agencies obligations [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 2,887 |  | 298,313 |  |  |
Unrealized Losses Less than 12 months | 4 |  | 18,057 |  |  |
Fair Value 12 months or more | 2,496,214 |  | 2,174,724 |  |  |
Unrealized Losses 12 months or more | 224,585 |  | 231,357 |  |  |
Total Fair Value | 2,499,101 |  | 2,473,037 |  |  |
Total Unrealized Losses | 224,589 |  | 249,414 |  |  |
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 | 2,111 |  | 2,201 |  |  |
Unrealized Losses 12 months or more | 794 |  | 755 |  |  |
Total Fair Value | 2,111 |  | 2,201 |  |  |
Total Unrealized Losses | 794 |  | 755 |  |  |
Allowance for Credit Losses | 350 | 366 | 375 | 386 | 308 | 308
Residential MBS [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Allowance for Credit Losses | 84 |  | 83 |  |  |
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 | 19,638 |  | 260,524 |  |  |
Unrealized Losses Less than 12 months | 959 |  | 45,424 |  |  |
Fair Value 12 months or more | 1,011,666 |  | 831,637 |  |  |
Unrealized Losses 12 months or more | 197,979 |  | 160,012 |  |  |
Total Fair Value | 1,031,304 |  | 1,092,161 |  |  |
Total Unrealized Losses | 198,938 |  | 205,436 |  |  |
Residential MBS [Member] | GNMA [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 50,543 |  | 74,829 |  |  |
Unrealized Losses Less than 12 months | 1,335 |  | 3,433 |  |  |
Fair Value 12 months or more | 189,454 |  | 179,854 |  |  |
Unrealized Losses 12 months or more | 29,534 |  | 28,167 |  |  |
Total Fair Value | 239,997 |  | 254,683 |  |  |
Total Unrealized Losses | 30,869 |  | 31,600 |  |  |
Residential MBS [Member] | FNMA [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 42,650 |  | 405,977 |  |  |
Unrealized Losses Less than 12 months | 2,361 |  | 49,479 |  |  |
Fair Value 12 months or more | 1,204,127 |  | 920,200 |  |  |
Unrealized Losses 12 months or more | 209,264 |  | 169,419 |  |  |
Total Fair Value | 1,246,777 |  | 1,326,177 |  |  |
Total Unrealized Losses | 211,625 |  | 218,898 |  |  |
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 | 378 |  | 45,370 |  |  |
Unrealized Losses Less than 12 months | 10 |  | 6,735 |  |  |
Fair Value 12 months or more | 229,549 |  | 200,323 |  |  |
Unrealized Losses 12 months or more | 58,257 |  | 49,804 |  |  |
Total Fair Value | 229,927 |  | 245,693 |  |  |
Total Unrealized Losses | 58,267 |  | 56,539 |  |  |
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 | 5,246 |  | 5,794 |  |  |
Unrealized Losses 12 months or more | 2,168 |  | 2,026 |  |  |
Total Fair Value | 5,246 |  | 5,794 |  |  |
Total Unrealized Losses | 2,168 |  | 2,026 |  |  |
Allowance for Credit Losses | 83 | $ 83 | 83 | $ 290 | $ 403 | $ 797
Commercial MBS [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 15,403 |  | 30,179 |  |  |
Unrealized Losses Less than 12 months | 370 |  | 2,215 |  |  |
Fair Value 12 months or more | 141,061 |  | 132,953 |  |  |
Unrealized Losses 12 months or more | 38,335 |  | 31,583 |  |  |
Total Fair Value | 156,464 |  | 163,132 |  |  |
Total Unrealized Losses | 38,705 |  | 33,798 |  |  |
Allowance for Credit Losses | $ 0 |  | $ 0 |  |  |

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