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DEBT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months $ 50,104   $ 26,180      
Unrealized Losses Less than 12 months 665   120      
Fair Value 12 months or more 4,875,876   5,170,265      
Unrealized Losses 12 months or more 636,825   632,929      
Total Fair Value 4,925,980   5,196,445      
Total Unrealized Losses 637,490   633,049      
Allowance for Credit Losses 549 $ 442 511 $ 433 $ 449 $ 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 875   2,544      
Unrealized Losses Less than 12 months 0   2      
Fair Value 12 months or more 2,338,381   2,428,784      
Unrealized Losses 12 months or more 132,562   157,026      
Total Fair Value 2,339,256   2,431,328      
Total Unrealized Losses 132,562   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 1,532   1,415      
Unrealized Losses 12 months or more 1,166   1,346      
Total Fair Value 1,532   1,415      
Total Unrealized Losses 1,166   1,346      
Allowance for Credit Losses 386 326 395 350 366 375
Residential MBS [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Allowance for Credit Losses 163   116      
Residential MBS [Member] | Private label [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Allowance for Credit Losses 163   100      
Residential MBS [Member] | FHLMC [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 1,191   9      
Unrealized Losses Less than 12 months 15   0      
Fair Value 12 months or more 915,156   988,092      
Unrealized Losses 12 months or more 186,218   174,786      
Total Fair Value 916,347   988,101      
Total Unrealized Losses 186,233   174,786      
Residential MBS [Member] | GNMA [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 11,188   12,257      
Unrealized Losses Less than 12 months 123   100      
Fair Value 12 months or more 188,231   202,390      
Unrealized Losses 12 months or more 29,282   25,808      
Total Fair Value 199,419   214,647      
Total Unrealized Losses 29,405   25,908      
Residential MBS [Member] | FNMA [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 8,135   0      
Unrealized Losses Less than 12 months 99   0      
Fair Value 12 months or more 1,088,394   1,183,275      
Unrealized Losses 12 months or more 190,017   180,913      
Total Fair Value 1,096,529   1,183,275      
Total Unrealized Losses 190,116   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 202,963   221,276      
Unrealized Losses 12 months or more 54,810   52,263      
Total Fair Value 202,963   221,276      
Total Unrealized Losses 54,810   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 4,567   4,785      
Unrealized Losses 12 months or more 1,951   2,185      
Total Fair Value 4,567   4,785      
Total Unrealized Losses 1,951   2,185      
Allowance for Credit Losses 163 $ 116 116 $ 83 $ 83 $ 83
Commercial MBS [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 28,715   11,370      
Unrealized Losses Less than 12 months 428   18      
Fair Value 12 months or more 136,652   140,248      
Unrealized Losses 12 months or more 40,819   38,602      
Total Fair Value 165,367   151,618      
Total Unrealized Losses 41,247   38,620      
Allowance for Credit Losses $ 0   $ 0