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DEBT SECURITIES - Available-for-Sale Investments Fair Value and Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | $ 225,142 |  | $ 217,444 |  |  |
Unrealized Losses Less than 12 months | 531 |  | 1,831 |  |  |
Fair Value 12 months or more | 3,473,534 |  | 4,247,078 |  |  |
Unrealized Losses 12 months or more | 390,131 |  | 557,937 |  |  |
Total Fair Value | 3,698,676 |  | 4,464,522 |  |  |
Total Unrealized Losses | 390,662 |  | 559,768 |  |  |
Allowance for Credit Losses | 658 | $ 513 | 521 | $ 526 | $ 549 | $ 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 | 156,093 |  | 8,005 |  |  |
Unrealized Losses Less than 12 months | 61 |  | 35 |  |  |
Fair Value 12 months or more | 1,247,412 |  | 1,886,046 |  |  |
Unrealized Losses 12 months or more | 28,837 |  | 76,824 |  |  |
Total Fair Value | 1,403,505 |  | 1,894,051 |  |  |
Total Unrealized Losses | 28,898 |  | 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 | 1,579 |  | 1,620 |  |  |
Unrealized Losses 12 months or more | 846 |  | 986 |  |  |
Total Fair Value | 1,579 |  | 1,620 |  |  |
Total Unrealized Losses | 846 |  | 986 |  |  |
Allowance for Credit Losses | 328 | 337 | 345 | 350 | 386 | 395
Residential MBS [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Allowance for Credit Losses | 330 |  | 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 | 809,506 |  | 857,492 |  |  |
Unrealized Losses 12 months or more | 134,048 |  | 179,043 |  |  |
Total Fair Value | 809,506 |  | 893,716 |  |  |
Total Unrealized Losses | 134,048 |  | 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 | 20,286 |  | 22,281 |  |  |
Unrealized Losses Less than 12 months | 148 |  | 508 |  |  |
Fair Value 12 months or more | 158,847 |  | 166,470 |  |  |
Unrealized Losses 12 months or more | 20,965 |  | 28,014 |  |  |
Total Fair Value | 179,133 |  | 188,751 |  |  |
Total Unrealized Losses | 21,113 |  | 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 | 938,952 |  | 1,012,331 |  |  |
Unrealized Losses 12 months or more | 126,688 |  | 178,991 |  |  |
Total Fair Value | 938,952 |  | 1,065,656 |  |  |
Total Unrealized Losses | 126,688 |  | 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 | 40,999 |  | 52,778 |  |  |
Unrealized Losses Less than 12 months | 159 |  | 248 |  |  |
Fair Value 12 months or more | 174,556 |  | 187,772 |  |  |
Unrealized Losses 12 months or more | 40,670 |  | 52,090 |  |  |
Total Fair Value | 215,555 |  | 240,550 |  |  |
Total Unrealized Losses | 40,829 |  | 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 | 3,332 |  | 4,195 |  |  |
Unrealized Losses 12 months or more | 1,636 |  | 1,715 |  |  |
Total Fair Value | 3,332 |  | 4,195 |  |  |
Total Unrealized Losses | 1,636 |  | 1,715 |  |  |
Allowance for Credit Losses | 330 | $ 176 | 176 | $ 176 | $ 163 | $ 116
Commercial MBS [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Fair Value Less than 12 months | 7,764 |  | 44,831 |  |  |
Unrealized Losses Less than 12 months | 163 |  | 823 |  |  |
Fair Value 12 months or more | 139,350 |  | 131,152 |  |  |
Unrealized Losses 12 months or more | 36,441 |  | 40,274 |  |  |
Total Fair Value | 147,114 |  | 175,983 |  |  |
Total Unrealized Losses | 36,604 |  | 41,097 |  |  |
Allowance for Credit Losses | $ 0 |  | $ 0 |  |  |

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