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DEBT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | $ 6,398,197 | $ 6,534,503
Gross Unrealized Gains | 247 | 28,900
Gross Unrealized Losses | 798,466 | 108,537
Allowance for Credit Losses | 458 | 1,105
Fair value | $ 5,599,520 | $ 6,453,761
Weighted-average yield | 1.22% | 1.03%
Accrued interest receivable excluded from estimate of credit losses | $ 11,100 | $ 10,100
U.S. Treasury securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year | 7,493 |
Gross Unrealized Gains Due within one year | 0 |
Gross Unrealized Losses Due within one year | 309 |
Allowance for Credit Losses within one year | 0 |
Fair value Due within one year | $ 7,184 |
Weighted-average yield Due within one year | 0.22% |
Amortized cost After 1 to 5 years | $ 141,366 | 149,660
Gross Unrealized Gains After 1 to 5 years | 0 | 59
Gross Unrealized Losses After 1 to 5 years | 9,675 | 1,233
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 131,691 | $ 148,486
Weighted-average yield After 1 to 5 years | 0.70% | 0.68%
U.S. GSE's obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year | $ 129,018 |
Gross Unrealized Gains Due within one year | 0 |
Gross Unrealized Losses Due within one year | 4,036 |
Allowance for Credit Losses within one year | 0 |
Fair value Due within one year | $ 124,982 |
Weighted-average yield Due within one year | 0.32% |
Amortized cost After 1 to 5 years | $ 2,395,273 | $ 1,877,181
Gross Unrealized Gains After 1 to 5 years | 22 | 240
Gross Unrealized Losses After 1 to 5 years | 227,724 | 29,555
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 2,167,571 | $ 1,847,866
Weighted-average yield After 1 to 5 years | 0.83% | 0.60%
Amortized cost After 5 to 10 years | $ 56,251 | $ 403,785
Gross Unrealized Gains After 5 to 10 years | 13 | 175
Gross Unrealized Losses After 5 to 10 years | 7,670 | 10,856
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 48,594 | $ 393,104
Weighted-average yield After 5 to 10 years | 1.54% | 0.90%
Amortized cost After 10 years | $ 12,170 | $ 15,788
Gross Unrealized Gains After 10 years | 36 | 224
Gross Unrealized Losses After 10 years | 0 | 0
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 12,206 | $ 16,012
Weighted-average yield After 10 years | 4.62% | 0.63%
Puerto Rico government obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 10 years | $ 3,331 | $ 3,574
Gross Unrealized Gains After 10 years | 0 | 0
Gross Unrealized Losses After 10 years | 755 | 416
Allowance for Credit Losses After 10 years | 375 | 308
Fair value After 10 years | $ 2,201 | $ 2,850
Weighted-average yield After 10 years | 0.00% | 0.00%
Allowance for Credit Losses | $ 400 | $ 300
United States And Puerto Rico Government Obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | 2,744,902 | 2,449,988
Gross Unrealized Gains | 71 | 698
Gross Unrealized Losses | 250,169 | 42,060
Allowance for Credit Losses | 375 | 308
Fair value | $ 2,494,429 | $ 2,408,318
Weighted-average yield | 0.83% | 0.67%
MBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | $ 3,652,795 | $ 4,083,515
Gross Unrealized Gains | 176 | 28,202
Gross Unrealized Losses | 548,297 | 66,477
Allowance for Credit Losses | 83 | 797
Fair value | $ 3,104,591 | $ 4,044,443
Weighted-average yield | 1.52% | 1.26%
MBS [Member] | FHLMC [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 1 to 5 years | $ 4,235 | $ 2,811
Gross Unrealized Gains After 1 to 5 years | 0 | 119
Gross Unrealized Losses After 1 to 5 years | 169 | 0
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 4,066 | $ 2,930
Weighted-average yield After 1 to 5 years | 2.33% | 2.65%
Amortized cost After 5 to 10 years | $ 204,085 | $ 193,234
Gross Unrealized Gains After 5 to 10 years | 0 | 2,419
Gross Unrealized Losses After 5 to 10 years | 19,061 | 1,122
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 185,024 | $ 194,531
Weighted-average yield After 5 to 10 years | 1.55% | 1.29%
Amortized cost After 10 years | $ 1,092,289 | $ 1,240,964
Gross Unrealized Gains After 10 years | 0 | 3,748
Gross Unrealized Losses After 10 years | 186,558 | 23,503
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 905,731 | $ 1,221,209
Weighted-average yield After 10 years | 1.38% | 1.18%
Amortized cost | $ 1,300,609 | $ 1,437,009
Gross Unrealized Gains | 0 | 6,286
Gross Unrealized Losses | 205,788 | 24,625
Allowance for Credit Losses | 0 | 0
Fair value | $ 1,094,821 | $ 1,418,670
Weighted-average yield | 1.41% | 1.20%
MBS [Member] | GNMA [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year | $ 5 | $ 2
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 | $ 5 | $ 2
Weighted-average yield Due within one year | 1.73% | 1.32%
Amortized cost After 1 to 5 years | $ 15,508 | $ 16,714
Gross Unrealized Gains After 1 to 5 years | 0 | 572
Gross Unrealized Losses After 1 to 5 years | 622 | 0
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 14,886 | $ 17,286
Weighted-average yield After 1 to 5 years | 2.00% | 2.90%
Amortized cost After 5 to 10 years | $ 45,322 | $ 27,271
Gross Unrealized Gains After 5 to 10 years | 1 | 80
Gross Unrealized Losses After 5 to 10 years | 3,809 | 139
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 41,514 | $ 27,212
Weighted-average yield After 5 to 10 years | 1.31% | 0.51%
Amortized cost After 10 years | $ 232,632 | $ 338,927
Gross Unrealized Gains After 10 years | 51 | 7,091
Gross Unrealized Losses After 10 years | 27,169 | 2,174
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 205,514 | $ 343,844
Weighted-average yield After 10 years | 2.47% | 1.45%
Amortized cost | $ 293,467 | $ 382,914
Gross Unrealized Gains | 52 | 7,743
Gross Unrealized Losses | 31,600 | 2,313
Allowance for Credit Losses | 0 | 0
Fair value | $ 261,919 | $ 388,344
Weighted-average yield | 2.27% | 1.45%
MBS [Member] | FNMA [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year |  | $ 4,975
Gross Unrealized Gains Due within one year |  | 21
Gross Unrealized Losses Due within one year |  | 0
Allowance for Credit Losses within one year |  | 0
Fair value Due within one year |  | $ 4,996
Weighted-average yield Due within one year |  | 2.03%
Amortized cost After 1 to 5 years | $ 9,685 | $ 21,337
Gross Unrealized Gains After 1 to 5 years | 0 | 424
Gross Unrealized Losses After 1 to 5 years | 521 | 0
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 9,164 | $ 21,761
Weighted-average yield After 1 to 5 years | 1.76% | 2.87%
Amortized cost After 5 to 10 years | $ 400,223 | $ 298,771
Gross Unrealized Gains After 5 to 10 years | 0 | 4,387
Gross Unrealized Losses After 5 to 10 years | 36,871 | 1,917
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 363,352 | $ 301,241
Weighted-average yield After 5 to 10 years | 1.70% | 1.41%
Amortized cost After 10 years | $ 1,186,635 | $ 1,389,381
Gross Unrealized Gains After 10 years | 124 | 8,953
Gross Unrealized Losses After 10 years | 186,757 | 21,747
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 1,000,002 | $ 1,376,587
Weighted-average yield After 10 years | 1.38% | 1.21%
Amortized cost | $ 1,596,543 | $ 1,714,464
Gross Unrealized Gains | 124 | 13,785
Gross Unrealized Losses | 224,149 | 23,664
Allowance for Credit Losses | 0 | 0
Fair value | $ 1,372,518 | $ 1,704,585
Weighted-average yield | 1.46% | 1.27%
MBS [Member] | Collateralized mortgage obligations guaranteed by FHLMC, FNMA and GNMA [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 1 to 5 years | $ 30,578 | $ 24,007
Gross Unrealized Gains After 1 to 5 years | 0 | 1
Gross Unrealized Losses After 1 to 5 years | 4,463 | 778
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 26,115 | $ 23,230
Weighted-average yield After 1 to 5 years | 2.43% | 1.31%
Amortized cost After 5 to 10 years |  | $ 14,316
Gross Unrealized Gains After 5 to 10 years |  | 97
Gross Unrealized Losses After 5 to 10 years |  | 0
Allowance for Credit Losses After 5 to 10 years |  | 0
Fair value After 5 to 10 years |  | $ 14,413
Weighted-average yield After 5 to 10 years |  | 0.76%
Amortized cost After 10 years | $ 423,695 | $ 500,811
Gross Unrealized Gains After 10 years | 0 | 290
Gross Unrealized Losses After 10 years | 80,271 | 13,134
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 343,424 | $ 487,967
Weighted-average yield After 10 years | 1.38% | 1.23%
Amortized cost | $ 454,273 | $ 539,134
Gross Unrealized Gains | 0 | 388
Gross Unrealized Losses | 84,734 | 13,912
Allowance for Credit Losses | 0 | 0
Fair value | $ 369,539 | $ 525,610
Weighted-average yield | 1.45% | 1.22%
MBS [Member] | Private label [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 10 years | $ 7,903 | $ 9,994
Gross Unrealized Gains After 10 years | 0 | 0
Gross Unrealized Losses After 10 years | 2,026 | 1,963
Allowance for Credit Losses After 10 years | 83 | 797
Fair value After 10 years | $ 5,794 | $ 7,234
Weighted-average yield After 10 years | 6.83% | 2.21%
Gross Unrealized Losses | $ 2,100 |
Allowance for Credit Losses | 100 | $ 800
Fair value | $ 5,800 |
Weighted-average yield | 6.83% |
Other Debt Obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year | $ 500 | 500
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 | $ 500 | $ 500
Weighted-average yield Due within one year | 0.84% | 0.72%
Amortized cost After 1 to 5 years |  | $ 500
Gross Unrealized Gains After 1 to 5 years |  | 0
Gross Unrealized Losses After 1 to 5 years |  | 0
Allowance for Credit Losses After 1 to 5 years |  | 0
Fair value After 1 to 5 years |  | $ 500
Weighted-average yield After 1 to 5 years |  | 0.84%
Amortized cost |  | $ 1,000
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Allowance for Credit Losses |  | 0
Fair value |  | $ 1,000
Weighted-average yield |  | 0.78%

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