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DEBT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | $ 46,731 |  | $ 1,115,192 |  |  |
Unrealized Losses Less than 12 months | 1,619 |  | 125,343 |  |  |
Fair Value 12 months or more | 5,114,046 |  | 4,447,686 |  |  |
Unrealized Losses 12 months or more | 843,258 |  | 673,123 |  |  |
Total Fair Value | 5,160,777 |  | 5,562,878 |  |  |
Total Unrealized Losses | 844,877 |  | 798,466 |  |  |
Allowance for Credit Losses | 465 | $ 433 | 458 | $ 664 | $ 676 | $ 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 | 3,204 |  | 298,313 |  |  |
Unrealized Losses Less than 12 months | 5 |  | 18,057 |  |  |
Fair Value 12 months or more | 2,430,083 |  | 2,174,724 |  |  |
Unrealized Losses 12 months or more | 217,105 |  | 231,357 |  |  |
Total Fair Value | 2,433,287 |  | 2,473,037 |  |  |
Total Unrealized Losses | 217,110 |  | 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 | 1,448 |  | 2,201 |  |  |
Unrealized Losses 12 months or more | 1,374 |  | 755 |  |  |
Total Fair Value | 1,448 |  | 2,201 |  |  |
Total Unrealized Losses | 1,374 |  | 755 |  |  |
Allowance for Credit Losses | 382 | 350 | 375 | 374 | 386 | 308
Residential MBS [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Allowance for Credit Losses | 83 |  | 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 | 12 |  | 260,524 |  |  |
Unrealized Losses Less than 12 months | 1 |  | 45,424 |  |  |
Fair Value 12 months or more | 964,295 |  | 831,637 |  |  |
Unrealized Losses 12 months or more | 231,317 |  | 160,012 |  |  |
Total Fair Value | 964,307 |  | 1,092,161 |  |  |
Total Unrealized Losses | 231,318 |  | 205,436 |  |  |
Residential MBS [Member] | GNMA [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 22,811 |  | 74,829 |  |  |
Unrealized Losses Less than 12 months | 1,220 |  | 3,433 |  |  |
Fair Value 12 months or more | 200,360 |  | 179,854 |  |  |
Unrealized Losses 12 months or more | 36,590 |  | 28,167 |  |  |
Total Fair Value | 223,171 |  | 254,683 |  |  |
Total Unrealized Losses | 37,810 |  | 31,600 |  |  |
Residential MBS [Member] | FNMA [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 9,195 |  | 405,977 |  |  |
Unrealized Losses Less than 12 months | 191 |  | 49,479 |  |  |
Fair Value 12 months or more | 1,161,636 |  | 920,200 |  |  |
Unrealized Losses 12 months or more | 244,367 |  | 169,419 |  |  |
Total Fair Value | 1,170,831 |  | 1,326,177 |  |  |
Total Unrealized Losses | 244,558 |  | 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 | 0 |  | 45,370 |  |  |
Unrealized Losses Less than 12 months | 0 |  | 6,735 |  |  |
Fair Value 12 months or more | 217,168 |  | 200,323 |  |  |
Unrealized Losses 12 months or more | 62,888 |  | 49,804 |  |  |
Total Fair Value | 217,168 |  | 245,693 |  |  |
Total Unrealized Losses | 62,888 |  | 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 | 4,918 |  | 5,794 |  |  |
Unrealized Losses 12 months or more | 2,310 |  | 2,026 |  |  |
Total Fair Value | 4,918 |  | 5,794 |  |  |
Total Unrealized Losses | 2,310 |  | 2,026 |  |  |
Allowance for Credit Losses | 83 | $ 83 | 83 | $ 290 | $ 290 | $ 797
Commercial MBS [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 11,509 |  | 30,179 |  |  |
Unrealized Losses Less than 12 months | 202 |  | 2,215 |  |  |
Fair Value 12 months or more | 134,138 |  | 132,953 |  |  |
Unrealized Losses 12 months or more | 47,307 |  | 31,583 |  |  |
Total Fair Value | 145,647 |  | 163,132 |  |  |
Total Unrealized Losses | 47,509 |  | 33,798 |  |  |
Allowance for Credit Losses | $ 0 |  | $ 0 |  |  |

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