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DEBT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months $ 140,533 $ 1,115,192
Unrealized Losses Less than 12 months 4,267 125,343
Fair Value 12 months or more 5,404,287 4,447,686
Unrealized Losses 12 months or more 707,011 673,123
Total Fair Value 5,544,820 5,562,878
Total Unrealized Losses 711,278 798,466
Allowance for Credit Losses 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 17,615 298,313
Unrealized Losses Less than 12 months 611 18,057
Fair Value 12 months or more 2,496,925 2,174,724
Unrealized Losses 12 months or more 208,711 231,357
Total Fair Value 2,514,540 2,473,037
Total Unrealized Losses 209,322 249,414
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 2,203 2,201
Unrealized Losses 12 months or more 733 755
Total Fair Value 2,203 2,201
Total Unrealized Losses 733 755
Allowance for Credit Losses 400 400
Residential MBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Allowance for Credit Losses 83 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 21,354 260,524
Unrealized Losses Less than 12 months 710 45,424
Fair Value 12 months or more 1,057,950 831,637
Unrealized Losses 12 months or more 185,677 160,012
Total Fair Value 1,079,304 1,092,161
Total Unrealized Losses 186,387 205,436
Residential MBS [Member] | GNMA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 45,949 74,829
Unrealized Losses Less than 12 months 868 3,433
Fair Value 12 months or more 197,581 179,854
Unrealized Losses 12 months or more 27,185 28,167
Total Fair Value 243,530 254,683
Total Unrealized Losses 28,053 31,600
Residential MBS [Member] | FNMA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 41,186 405,977
Unrealized Losses Less than 12 months 1,741 49,479
Fair Value 12 months or more 1,262,700 920,200
Unrealized Losses 12 months or more 196,496 169,419
Total Fair Value 1,303,886 1,326,177
Total Unrealized Losses 198,237 218,898
Residential MBS [Member] | Collateralized mortgage obligations guaranteed by FHLMC, FNMA and GNMA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 10,596 45,370
Unrealized Losses Less than 12 months 117 6,735
Fair Value 12 months or more 232,886 200,323
Unrealized Losses 12 months or more 52,423 49,804
Total Fair Value 243,482 245,693
Total Unrealized Losses 52,540 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 5,402 5,794
Unrealized Losses 12 months or more 2,210 2,026
Total Fair Value 5,402 5,794
Total Unrealized Losses 2,210 2,026
Commercial MBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 3,833 30,179
Unrealized Losses Less than 12 months 220 2,215
Fair Value 12 months or more 148,640 132,953
Unrealized Losses 12 months or more 33,576 31,583
Total Fair Value 152,473 163,132
Total Unrealized Losses 33,796 33,798
Allowance for Credit Losses $ 0 $ 0