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DEBT SECURITIES - Available-for-Sale Investments Fair Value and Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | $ 159,393 |  | $ 217,444 |  |  |
Unrealized Losses Less than 12 months | 877 |  | 1,831 |  |  |
Fair Value 12 months or more | 3,813,664 |  | 4,247,078 |  |  |
Unrealized Losses 12 months or more | 436,346 |  | 557,937 |  |  |
Total Fair Value | 3,973,057 |  | 4,464,522 |  |  |
Total Unrealized Losses | 437,223 |  | 559,768 |  |  |
Allowance for Credit Losses | 513 | $ 516 | 521 | $ 549 | $ 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 | 104,471 |  | 8,005 |  |  |
Unrealized Losses Less than 12 months | 47 |  | 35 |  |  |
Fair Value 12 months or more | 1,545,519 |  | 1,886,046 |  |  |
Unrealized Losses 12 months or more | 42,780 |  | 76,824 |  |  |
Total Fair Value | 1,649,990 |  | 1,894,051 |  |  |
Total Unrealized Losses | 42,827 |  | 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 | 1,576 |  | 1,620 |  |  |
Unrealized Losses 12 months or more | 920 |  | 986 |  |  |
Total Fair Value | 1,576 |  | 1,620 |  |  |
Total Unrealized Losses | 920 |  | 986 |  |  |
Allowance for Credit Losses | 337 | 340 | 345 | 386 | 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 | 0 |  | 36,224 |  |  |
Unrealized Losses Less than 12 months | 0 |  | 85 |  |  |
Fair Value 12 months or more | 829,030 |  | 857,492 |  |  |
Unrealized Losses 12 months or more | 146,792 |  | 179,043 |  |  |
Total Fair Value | 829,030 |  | 893,716 |  |  |
Total Unrealized Losses | 146,792 |  | 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 | 15,257 |  | 22,281 |  |  |
Unrealized Losses Less than 12 months | 221 |  | 508 |  |  |
Fair Value 12 months or more | 155,770 |  | 166,470 |  |  |
Unrealized Losses 12 months or more | 23,578 |  | 28,014 |  |  |
Total Fair Value | 171,027 |  | 188,751 |  |  |
Total Unrealized Losses | 23,799 |  | 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 | 969,968 |  | 1,012,331 |  |  |
Unrealized Losses 12 months or more | 139,154 |  | 178,991 |  |  |
Total Fair Value | 969,968 |  | 1,065,656 |  |  |
Total Unrealized Losses | 139,154 |  | 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 | 8,683 |  | 52,778 |  |  |
Unrealized Losses Less than 12 months | 14 |  | 248 |  |  |
Fair Value 12 months or more | 176,975 |  | 187,772 |  |  |
Unrealized Losses 12 months or more | 44,556 |  | 52,090 |  |  |
Total Fair Value | 185,658 |  | 240,550 |  |  |
Total Unrealized Losses | 44,570 |  | 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 | 3,781 |  | 4,195 |  |  |
Unrealized Losses 12 months or more | 1,490 |  | 1,715 |  |  |
Total Fair Value | 3,781 |  | 4,195 |  |  |
Total Unrealized Losses | 1,490 |  | 1,715 |  |  |
Allowance for Credit Losses | 176 | $ 176 | 176 | $ 163 | $ 116 | $ 116
Commercial MBS [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 30,982 |  | 44,831 |  |  |
Unrealized Losses Less than 12 months | 595 |  | 823 |  |  |
Fair Value 12 months or more | 131,045 |  | 131,152 |  |  |
Unrealized Losses 12 months or more | 37,076 |  | 40,274 |  |  |
Total Fair Value | 162,027 |  | 175,983 |  |  |
Total Unrealized Losses | 37,671 |  | 41,097 |  |  |
Allowance for Credit Losses | $ 0 |  | $ 0 |  |  |

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