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DEBT SECURITIES - Available-for-Sale Investments Fair Value and Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Fair Value Less than 12 months | $ 48,908 | $ 217,444 |  |
Unrealized Losses Less than 12 months | 677 | 1,831 |  |
Fair Value 12 months or more | 4,000,414 | 4,247,078 |  |
Unrealized Losses 12 months or more | 476,437 | 557,937 |  |
Total Fair Value | 4,049,322 | 4,464,522 |  |
Total Unrealized Losses | 477,114 | 559,768 |  |
Allowance for Credit Losses | 516 | 521 | $ 442 | $ 511
U.S. Treasury and U.S. government agencies obligations [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Fair Value Less than 12 months | 8,099 | 8,005 |  |
Unrealized Losses Less than 12 months | 35 | 35 |  |
Fair Value 12 months or more | 1,664,851 | 1,886,046 |  |
Unrealized Losses 12 months or more | 57,147 | 76,824 |  |
Total Fair Value | 1,672,950 | 1,894,051 |  |
Total Unrealized Losses | 57,182 | 76,859 |  |
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 | 1,599 | 1,620 |  |
Unrealized Losses 12 months or more | 960 | 986 |  |
Total Fair Value | 1,599 | 1,620 |  |
Total Unrealized Losses | 960 | 986 |  |
Allowance for Credit Losses | 340 | 345 | 326 | 395
Residential MBS [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Allowance for Credit Losses | 176 | 176 |  |
Residential MBS [Member] | FHLMC [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Fair Value Less than 12 months | 1,188 | 36,224 |  |
Unrealized Losses Less than 12 months | 1 | 85 |  |
Fair Value 12 months or more | 851,798 | 857,492 |  |
Unrealized Losses 12 months or more | 155,598 | 179,043 |  |
Total Fair Value | 852,986 | 893,716 |  |
Total Unrealized Losses | 155,599 | 179,128 |  |
Allowance for Credit Losses | 0 | 0 |  |
Residential MBS [Member] | GNMA [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Fair Value Less than 12 months | 15,671 | 22,281 |  |
Unrealized Losses Less than 12 months | 196 | 508 |  |
Fair Value 12 months or more | 162,660 | 166,470 |  |
Unrealized Losses 12 months or more | 24,650 | 28,014 |  |
Total Fair Value | 178,331 | 188,751 |  |
Total Unrealized Losses | 24,846 | 28,522 |  |
Allowance for Credit Losses | 0 | 0 |  |
Residential MBS [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Fair Value Less than 12 months | 0 | 53,325 |  |
Unrealized Losses Less than 12 months | 0 | 132 |  |
Fair Value 12 months or more | 999,306 | 1,012,331 |  |
Unrealized Losses 12 months or more | 151,519 | 178,991 |  |
Total Fair Value | 999,306 | 1,065,656 |  |
Total Unrealized Losses | 151,519 | 179,123 |  |
Allowance for Credit Losses | 0 | 0 |  |
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 | 3,094 | 52,778 |  |
Unrealized Losses Less than 12 months | 1 | 248 |  |
Fair Value 12 months or more | 184,045 | 187,772 |  |
Unrealized Losses 12 months or more | 47,197 | 52,090 |  |
Total Fair Value | 187,139 | 240,550 |  |
Total Unrealized Losses | 47,198 | 52,338 |  |
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 | 4,034 | 4,195 |  |
Unrealized Losses 12 months or more | 1,695 | 1,715 |  |
Total Fair Value | 4,034 | 4,195 |  |
Total Unrealized Losses | 1,695 | 1,715 |  |
Allowance for Credit Losses | 176 | 176 | $ 116 | $ 116
Commercial MBS [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Fair Value Less than 12 months | 20,856 | 44,831 |  |
Unrealized Losses Less than 12 months | 444 | 823 |  |
Fair Value 12 months or more | 132,121 | 131,152 |  |
Unrealized Losses 12 months or more | 37,671 | 40,274 |  |
Total Fair Value | 152,977 | 175,983 |  |
Total Unrealized Losses | 38,115 | 41,097 |  |
Allowance for Credit Losses | $ 0 | $ 0 |  |

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