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DEBT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months $ 131,499   $ 1,115,192      
Unrealized Losses Less than 12 months 5,039   125,343      
Fair Value 12 months or more 5,279,428   4,447,686      
Unrealized Losses 12 months or more 760,916   673,123      
Total Fair Value 5,410,927   5,562,878      
Total Unrealized Losses 765,955   798,466      
Allowance for Credit Losses 433 $ 449 458 $ 676 $ 711 $ 1,105
U.S. Treasury and U.S. government agencies obligations [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 2,887   298,313      
Unrealized Losses Less than 12 months 4   18,057      
Fair Value 12 months or more 2,496,214   2,174,724      
Unrealized Losses 12 months or more 224,585   231,357      
Total Fair Value 2,499,101   2,473,037      
Total Unrealized Losses 224,589   249,414      
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 2,111   2,201      
Unrealized Losses 12 months or more 794   755      
Total Fair Value 2,111   2,201      
Total Unrealized Losses 794   755      
Allowance for Credit Losses 350 366 375 386 308 308
Residential MBS [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Allowance for Credit Losses 84   83      
Residential MBS [Member] | Private label [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Allowance for Credit Losses 100   100      
Residential MBS [Member] | FHLMC [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 19,638   260,524      
Unrealized Losses Less than 12 months 959   45,424      
Fair Value 12 months or more 1,011,666   831,637      
Unrealized Losses 12 months or more 197,979   160,012      
Total Fair Value 1,031,304   1,092,161      
Total Unrealized Losses 198,938   205,436      
Residential MBS [Member] | GNMA [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 50,543   74,829      
Unrealized Losses Less than 12 months 1,335   3,433      
Fair Value 12 months or more 189,454   179,854      
Unrealized Losses 12 months or more 29,534   28,167      
Total Fair Value 239,997   254,683      
Total Unrealized Losses 30,869   31,600      
Residential MBS [Member] | FNMA [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 42,650   405,977      
Unrealized Losses Less than 12 months 2,361   49,479      
Fair Value 12 months or more 1,204,127   920,200      
Unrealized Losses 12 months or more 209,264   169,419      
Total Fair Value 1,246,777   1,326,177      
Total Unrealized Losses 211,625   218,898      
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 378   45,370      
Unrealized Losses Less than 12 months 10   6,735      
Fair Value 12 months or more 229,549   200,323      
Unrealized Losses 12 months or more 58,257   49,804      
Total Fair Value 229,927   245,693      
Total Unrealized Losses 58,267   56,539      
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 5,246   5,794      
Unrealized Losses 12 months or more 2,168   2,026      
Total Fair Value 5,246   5,794      
Total Unrealized Losses 2,168   2,026      
Allowance for Credit Losses 83 $ 83 83 $ 290 $ 403 $ 797
Commercial MBS [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Fair Value Less than 12 months 15,403   30,179      
Unrealized Losses Less than 12 months 370   2,215      
Fair Value 12 months or more 141,061   132,953      
Unrealized Losses 12 months or more 38,335   31,583      
Total Fair Value 156,464   163,132      
Total Unrealized Losses 38,705   33,798      
Allowance for Credit Losses $ 0   $ 0