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DEBT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months $ 10,768   $ 26,180      
Unrealized Losses Less than 12 months 179   120      
Fair Value 12 months or more 4,785,206   5,170,265      
Unrealized Losses 12 months or more 478,265   632,929      
Total Fair Value 4,795,974   5,196,445      
Total Unrealized Losses 478,444   633,049      
Allowance for Credit Losses 526 $ 549 511 $ 465 $ 433 $ 458
U.S. Treasury and U.S. government agencies obligations [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 1,828   2,544      
Unrealized Losses Less than 12 months 4   2      
Fair Value 12 months or more 2,247,894   2,428,784      
Unrealized Losses 12 months or more 82,318   157,026      
Total Fair Value 2,249,722   2,431,328      
Total Unrealized Losses 82,322   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 1,567   1,415      
Unrealized Losses 12 months or more 1,091   1,346      
Total Fair Value 1,567   1,415      
Total Unrealized Losses 1,091   1,346      
Allowance for Credit Losses 350 386 395 382 350 375
Residential MBS [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Allowance for Credit Losses 176   116      
Residential MBS [Member] | Private label [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Allowance for Credit Losses 176   100      
Residential MBS [Member] | FHLMC [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 2   9      
Unrealized Losses Less than 12 months 0   0      
Fair Value 12 months or more 921,769   988,092      
Unrealized Losses 12 months or more 145,083   174,786      
Total Fair Value 921,771   988,101      
Total Unrealized Losses 145,083   174,786      
Residential MBS [Member] | GNMA [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 69   12,257      
Unrealized Losses Less than 12 months 1   100      
Fair Value 12 months or more 180,162   202,390      
Unrealized Losses 12 months or more 21,466   25,808      
Total Fair Value 180,231   214,647      
Total Unrealized Losses 21,467   25,908      
Residential MBS [Member] | FNMA [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 1,090,120   1,183,275      
Unrealized Losses 12 months or more 144,585   180,913      
Total Fair Value 1,090,120   1,183,275      
Total Unrealized Losses 144,585   180,913      
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 0   0      
Unrealized Losses Less than 12 months 0   0      
Fair Value 12 months or more 199,741   221,276      
Unrealized Losses 12 months or more 46,471   52,263      
Total Fair Value 199,741   221,276      
Total Unrealized Losses 46,471   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 4,321   4,785      
Unrealized Losses 12 months or more 1,848   2,185      
Total Fair Value 4,321   4,785      
Total Unrealized Losses 1,848   2,185      
Allowance for Credit Losses 176 $ 163 116 $ 83 $ 83 $ 83
Commercial MBS [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 8,869   11,370      
Unrealized Losses Less than 12 months 174   18      
Fair Value 12 months or more 139,632   140,248      
Unrealized Losses 12 months or more 35,403   38,602      
Total Fair Value 148,501   151,618      
Total Unrealized Losses 35,577   38,620      
Allowance for Credit Losses $ 0   $ 0