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DEBT SECURITIES - Available-for-Sale Investments Fair Value and Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value Less than 12 months | $ 217,444 | $ 26,180
Unrealized Losses Less than 12 months | 1,831 | 120
Fair Value 12 months or more | 4,247,078 | 5,170,265
Unrealized Losses 12 months or more | 557,937 | 632,929
Total Fair Value | 4,464,522 | 5,196,445
Total Unrealized Losses | 559,768 | 633,049
Allowance for Credit Losses | 521 | 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 | 8,005 | 2,544
Unrealized Losses Less than 12 months | 35 | 2
Fair Value 12 months or more | 1,886,046 | 2,428,784
Unrealized Losses 12 months or more | 76,824 | 157,026
Total Fair Value | 1,894,051 | 2,431,328
Total Unrealized Losses | 76,859 | 157,028
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 | 1,620 | 1,415
Unrealized Losses 12 months or more | 986 | 1,346
Total Fair Value | 1,620 | 1,415
Total Unrealized Losses | 986 | 1,346
Allowance for Credit Losses | 300 | 400
Residential MBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Allowance for Credit Losses | 176 | 116
Residential MBS [Member] | FHLMC [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value Less than 12 months | 36,224 | 9
Unrealized Losses Less than 12 months | 85 | 0
Fair Value 12 months or more | 857,492 | 988,092
Unrealized Losses 12 months or more | 179,043 | 174,786
Total Fair Value | 893,716 | 988,101
Total Unrealized Losses | 179,128 | 174,786
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 | 22,281 | 12,257
Unrealized Losses Less than 12 months | 508 | 100
Fair Value 12 months or more | 166,470 | 202,390
Unrealized Losses 12 months or more | 28,014 | 25,808
Total Fair Value | 188,751 | 214,647
Total Unrealized Losses | 28,522 | 25,908
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 | 53,325 | 0
Unrealized Losses Less than 12 months | 132 | 0
Fair Value 12 months or more | 1,012,331 | 1,183,275
Unrealized Losses 12 months or more | 178,991 | 180,913
Total Fair Value | 1,065,656 | 1,183,275
Total Unrealized Losses | 179,123 | 180,913
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 | 52,778 | 0
Unrealized Losses Less than 12 months | 248 | 0
Fair Value 12 months or more | 187,772 | 221,276
Unrealized Losses 12 months or more | 52,090 | 52,263
Total Fair Value | 240,550 | 221,276
Total Unrealized Losses | 52,338 | 52,263
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 | 4,195 | 4,785
Unrealized Losses 12 months or more | 1,715 | 2,185
Total Fair Value | 4,195 | 4,785
Total Unrealized Losses | 1,715 | 2,185
Allowance for Credit Losses | 176 | 100
Commercial MBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value Less than 12 months | 44,831 | 11,370
Unrealized Losses Less than 12 months | 823 | 18
Fair Value 12 months or more | 131,152 | 140,248
Unrealized Losses 12 months or more | 40,274 | 38,602
Total Fair Value | 175,983 | 151,618
Total Unrealized Losses | 41,097 | 38,620
Allowance for Credit Losses | $ 0 | $ 0

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