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DEBT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | $ 6,300,696 | $ 6,398,197
Gross Unrealized Gains | 287 | 247
Gross Unrealized Losses | 711,278 | 798,466
Allowance for Credit Losses | 449 | 458
Fair value | $ 5,589,256 | $ 5,599,520
Weighted-average yield | 1.23% | 1.22%
Accrued interest receivable excluded from estimate of credit losses | $ 10,700 | $ 11,100
U.S. Treasury securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year | 27,744 | 7,493
Gross Unrealized Gains Due within one year | 0 | 0
Gross Unrealized Losses Due within one year | 890 | 309
Allowance for Credit Losses within one year | 0 | 0
Fair value Due within one year | $ 26,854 | $ 7,184
Weighted-average yield Due within one year | 0.61% | 0.22%
Amortized cost After 1 to 5 years | $ 120,916 | $ 141,366
Gross Unrealized Gains After 1 to 5 years | 0 | 0
Gross Unrealized Losses After 1 to 5 years | 7,348 | 9,675
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 113,568 | $ 131,691
Weighted-average yield After 1 to 5 years | 0.69% | 0.70%
U.S. GSE's obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year | $ 189,174 | $ 129,018
Gross Unrealized Gains Due within one year | 0 | 0
Gross Unrealized Losses Due within one year | 5,100 | 4,036
Allowance for Credit Losses within one year | 0 | 0
Fair value Due within one year | $ 184,074 | $ 124,982
Weighted-average yield Due within one year | 0.42% | 0.32%
Amortized cost After 1 to 5 years | $ 2,349,522 | $ 2,395,273
Gross Unrealized Gains After 1 to 5 years | 22 | 22
Gross Unrealized Losses After 1 to 5 years | 190,986 | 227,724
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 2,158,558 | $ 2,167,571
Weighted-average yield After 1 to 5 years | 0.84% | 0.83%
Amortized cost After 5 to 10 years | $ 41,916 | $ 56,251
Gross Unrealized Gains After 5 to 10 years | 8 | 13
Gross Unrealized Losses After 5 to 10 years | 4,998 | 7,670
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 36,926 | $ 48,594
Weighted-average yield After 5 to 10 years | 1.64% | 1.54%
Amortized cost After 10 years | $ 11,625 | $ 12,170
Gross Unrealized Gains After 10 years | 27 | 36
Gross Unrealized Losses After 10 years | 0 | 0
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 11,652 | $ 12,206
Weighted-average yield After 10 years | 5.15% | 4.62%
Puerto Rico government obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 10 years | $ 3,302 | $ 3,331
Gross Unrealized Gains After 10 years | 0 | 0
Gross Unrealized Losses After 10 years | 733 | 755
Allowance for Credit Losses After 10 years | 366 | 375
Fair value After 10 years | $ 2,203 | $ 2,201
Weighted-average yield After 10 years | 0.00% | 0.00%
Allowance for Credit Losses | $ 400 | $ 400
United States And Puerto Rico Government Obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | 2,744,199 | 2,744,902
Gross Unrealized Gains | 57 | 71
Gross Unrealized Losses | 210,055 | 250,169
Allowance for Credit Losses | 366 | 375
Fair value | $ 2,533,835 | $ 2,494,429
Weighted-average yield | 0.83% | 0.83%
Residential MBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | $ 3,363,942 | $ 3,455,864
Gross Unrealized Gains | 223 | 176
Gross Unrealized Losses | 467,427 | 514,499
Allowance for Credit Losses | 83 | 83
Fair value | $ 2,896,655 | $ 2,941,458
Weighted-average yield | 1.55% | 1.52%
Residential MBS [Member] | FHLMC [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 1 to 5 years | $ 10,023 | $ 4,235
Gross Unrealized Gains After 1 to 5 years | 0 | 0
Gross Unrealized Losses After 1 to 5 years | 454 | 169
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 9,569 | $ 4,066
Weighted-average yield After 1 to 5 years | 1.98% | 2.33%
Amortized cost After 5 to 10 years | $ 187,007 | $ 201,072
Gross Unrealized Gains After 5 to 10 years | 0 | 0
Gross Unrealized Losses After 5 to 10 years | 15,912 | 18,709
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 171,095 | $ 182,363
Weighted-average yield After 5 to 10 years | 1.56% | 1.55%
Amortized cost After 10 years | $ 1,068,680 | $ 1,092,289
Gross Unrealized Gains After 10 years | 0 | 0
Gross Unrealized Losses After 10 years | 170,021 | 186,558
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 898,659 | $ 905,731
Weighted-average yield After 10 years | 1.41% | 1.38%
Amortized cost | $ 1,265,710 | $ 1,297,596
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 186,387 | 205,436
Allowance for Credit Losses | 0 | 0
Fair value | $ 1,079,323 | $ 1,092,160
Weighted-average yield | 1.44% | 1.41%
Residential MBS [Member] | GNMA [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year | $ 3 | $ 5
Gross Unrealized Gains Due within one year | 0 | 0
Gross Unrealized Losses Due within one year | 0 | 0
Allowance for Credit Losses within one year | 0 | 0
Fair value Due within one year | $ 3 | $ 5
Weighted-average yield Due within one year | 2.42% | 1.73%
Amortized cost After 1 to 5 years | $ 23,293 | $ 15,508
Gross Unrealized Gains After 1 to 5 years | 0 | 0
Gross Unrealized Losses After 1 to 5 years | 1,253 | 622
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 22,040 | $ 14,886
Weighted-average yield After 1 to 5 years | 1.31% | 2.00%
Amortized cost After 5 to 10 years | $ 33,939 | $ 45,322
Gross Unrealized Gains After 5 to 10 years | 0 | 1
Gross Unrealized Losses After 5 to 10 years | 2,720 | 3,809
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 31,219 | $ 41,514
Weighted-average yield After 5 to 10 years | 1.69% | 1.31%
Amortized cost After 10 years | $ 225,680 | $ 232,632
Gross Unrealized Gains After 10 years | 119 | 51
Gross Unrealized Losses After 10 years | 24,080 | 27,169
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 201,719 | $ 205,514
Weighted-average yield After 10 years | 2.58% | 2.47%
Amortized cost | $ 282,915 | $ 293,467
Gross Unrealized Gains | 119 | 52
Gross Unrealized Losses | 28,053 | 31,600
Allowance for Credit Losses | 0 | 0
Fair value | $ 254,981 | $ 261,919
Weighted-average yield | 2.37% | 2.27%
Residential MBS [Member] | FNMA [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 1 to 5 years | $ 24,446 | $ 9,685
Gross Unrealized Gains After 1 to 5 years | 0 | 0
Gross Unrealized Losses After 1 to 5 years | 1,249 | 521
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 23,197 | $ 9,164
Weighted-average yield After 1 to 5 years | 1.72% | 1.76%
Amortized cost After 5 to 10 years | $ 353,397 | $ 358,346
Gross Unrealized Gains After 5 to 10 years | 0 | 0
Gross Unrealized Losses After 5 to 10 years | 28,963 | 31,620
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 324,434 | $ 326,726
Weighted-average yield After 5 to 10 years | 1.74% | 1.68%
Amortized cost After 10 years | $ 1,133,757 | $ 1,186,635
Gross Unrealized Gains After 10 years | 104 | 124
Gross Unrealized Losses After 10 years | 168,025 | 186,757
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 965,836 | $ 1,000,002
Weighted-average yield After 10 years | 1.37% | 1.38%
Amortized cost | $ 1,511,600 | $ 1,554,666
Gross Unrealized Gains | 104 | 124
Gross Unrealized Losses | 198,237 | 218,898
Allowance for Credit Losses | 0 | 0
Fair value | $ 1,313,467 | $ 1,335,892
Weighted-average yield | 1.47% | 1.45%
Residential MBS [Member] | Collateralized mortgage obligations guaranteed by FHLMC, FNMA and GNMA [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 10 years | $ 296,022 | $ 302,232
Gross Unrealized Gains After 10 years | 0 | 0
Gross Unrealized Losses After 10 years | 52,540 | 56,539
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 243,482 | $ 245,693
Weighted-average yield After 10 years | 1.49% | 1.44%
Residential MBS [Member] | Private label [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 10 years | $ 7,695 | $ 7,903
Gross Unrealized Gains After 10 years | 0 | 0
Gross Unrealized Losses After 10 years | 2,210 | 2,026
Allowance for Credit Losses After 10 years | 83 | 83
Fair value After 10 years | $ 5,402 | $ 5,794
Weighted-average yield After 10 years | 7.25% | 6.83%
Gross Unrealized Losses | $ 2,300 |
Allowance for Credit Losses | 100 | $ 100
Fair value | $ 5,400 |
Weighted-average yield | 7.25% |
Commercial Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 1 to 5 years | $ 27,584 | 30,578
Gross Unrealized Gains After 1 to 5 years | 7 | 0
Gross Unrealized Losses After 1 to 5 years | 4,551 | 4,463
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 23,040 | $ 26,115
Weighted-average yield After 1 to 5 years | 2.27% | 2.43%
Amortized cost After 5 to 10 years | $ 44,584 | $ 44,889
Gross Unrealized Gains After 5 to 10 years | 0 | 0
Gross Unrealized Losses After 5 to 10 years | 4,929 | 5,603
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 39,655 | $ 39,286
Weighted-average yield After 5 to 10 years | 1.90% | 1.89%
Amortized cost After 10 years | $ 120,387 | $ 121,464
Gross Unrealized Gains After 10 years | 0 | 0
Gross Unrealized Losses After 10 years | 24,316 | 23,732
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 96,071 | $ 97,732
Weighted-average yield After 10 years | 1.23% | 1.23%
Amortized cost | $ 192,555 | $ 196,931
Gross Unrealized Gains | 7 | 0
Gross Unrealized Losses | 33,796 | 33,798
Allowance for Credit Losses | 0 | 0
Fair value | $ 158,766 | $ 163,133
Weighted-average yield | 1.53% | 1.56%
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | $ 3,556,497 | $ 3,652,795
Gross Unrealized Gains | 230 | 176
Gross Unrealized Losses | 501,223 | 548,297
Allowance for Credit Losses | 83 | 83
Fair value | $ 3,055,421 | $ 3,104,591
Weighted-average yield | 1.54% | 1.52%
Other Debt Obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year |  | $ 500
Gross Unrealized Gains Due within one year |  | 0
Gross Unrealized Losses Due within one year |  | 0
Allowance for Credit Losses within one year |  | 0
Fair value Due within one year |  | $ 500
Weighted-average yield Due within one year |  | 0.84%

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