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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