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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