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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