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DEBT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | $ 6,527,684 | $ 6,534,503
Gross Unrealized Gain | 398 | 28,900
Gross Unrealized Loss | 858,729 | 108,537
Allowance for Credit Losses | 664 | 1,105
Fair value | $ 5,668,689 | $ 6,453,761
Weighted-average yield | 1.21% | 1.03%
Accrued interest receivable, excluded from estimate of credit losses | $ 10,900 | $ 10,100
U.S. Treasury securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 1 to 5 years | 149,061 | 149,660
Gross Unrealized Gains After 1 to 5 years | 0 | 59
Gross Unrealized Losses After 1 to 5 years | 10,803 | 1,233
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 138,258 | $ 148,486
Weighted-average yield After 1 to 5 years | 0.67% | 0.68%
U.S. government-sponsored agencies obigations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year | $ 73,817 |
Gross Unrealized Gains Due within one year | 0 |
Gross Unrealized Losses Due within one year | 2,629 |
Allowance for Credit Losses within one year | 0 |
Fair value Due within one year | $ 71,188 |
Weighted-average yield Due within one year | 0.28% |
Amortized cost After 1 to 5 years | $ 2,306,065 | $ 1,877,181
Gross Unrealized Gains After 1 to 5 years | 22 | 240
Gross Unrealized Losses After 1 to 5 years | 224,427 | 29,555
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 2,081,660 | $ 1,847,866
Weighted-average yield After 1 to 5 years | 0.81% | 0.60%
Amortized cost After 5 to 10 years | $ 200,606 | $ 403,785
Gross Unrealized Gains After 5 to 10 years | 21 | 175
Gross Unrealized Losses After 5 to 10 years | 30,433 | 10,856
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 170,194 | $ 393,104
Weighted-average yield After 5 to 10 years | 1.01% | 0.90%
Amortized cost After 10 years | $ 12,919 | $ 15,788
Gross Unrealized Gains After 10 years | 58 | 224
Gross Unrealized Losses After 10 years | 0 | 0
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 12,977 | $ 16,012
Weighted-average yield After 10 years | 3.46% | 0.63%
Puerto Rico government obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 10 years | $ 3,365 | $ 3,574
Gross Unrealized Gains After 10 years | 0 | 0
Gross Unrealized Losses After 10 years | 798 | 416
Allowance for Credit Losses After 10 years | 374 | 308
Fair value After 10 years | $ 2,193 | $ 2,850
Weighted-average yield After 10 years | 0.00% | 0.00%
United States And Puerto Rico Government Obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | $ 2,745,833 | $ 2,449,988
Gross Unrealized Gain | 101 | 698
Gross Unrealized Loss | 269,090 | 42,060
Allowance for Credit Losses | 374 | 308
Fair value | $ 2,476,470 | $ 2,408,318
Weighted-average yield | 0.82% | 0.67%
MBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | $ 3,781,351 | $ 4,083,515
Gross Unrealized Gain | 297 | 28,202
Gross Unrealized Loss | 589,639 | 66,477
Allowance for Credit Losses | 290 | 797
Fair value | $ 3,191,719 | $ 4,044,443
Weighted-average yield | 1.49% | 1.26%
MBS [Member] | FHLMC [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 1 to 5 years | $ 4,655 | $ 2,811
Gross Unrealized Gains After 1 to 5 years | 0 | 119
Gross Unrealized Losses After 1 to 5 years | 184 | 0
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 4,471 | $ 2,930
Weighted-average yield After 1 to 5 years | 2.34% | 2.65%
Amortized cost After 5 to 10 years | $ 200,216 | $ 193,234
Gross Unrealized Gains After 5 to 10 years | 0 | 2,419
Gross Unrealized Losses After 5 to 10 years | 19,255 | 1,122
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 180,961 | $ 194,531
Weighted-average yield After 5 to 10 years | 1.48% | 1.29%
Amortized cost After 10 years | $ 1,133,339 | $ 1,240,964
Gross Unrealized Gains After 10 years | 0 | 3,748
Gross Unrealized Losses After 10 years | 203,768 | 23,503
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 929,571 | $ 1,221,209
Weighted-average yield After 10 years | 1.37% | 1.18%
Amortized cost | $ 1,338,210 | $ 1,437,009
Gross Unrealized Gain | 0 | 6,286
Gross Unrealized Loss | 223,207 | 24,625
Allowance for Credit Losses | 0 | 0
Fair value | $ 1,115,003 | $ 1,418,670
Weighted-average yield | 1.39% | 1.20%
MBS [Member] | GNMA [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year | $ 6 | $ 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 | $ 6 | $ 2
Weighted-average yield Due within one year | 1.84% | 1.32%
Amortized cost After 1 to 5 years | $ 17,672 | $ 16,714
Gross Unrealized Gains After 1 to 5 years | 1 | 572
Gross Unrealized Losses After 1 to 5 years | 731 | 0
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 16,942 | $ 17,286
Weighted-average yield After 1 to 5 years | 2.02% | 2.90%
Amortized cost After 5 to 10 years | $ 43,643 | $ 27,271
Gross Unrealized Gains After 5 to 10 years | 0 | 80
Gross Unrealized Losses After 5 to 10 years | 4,100 | 139
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 39,543 | $ 27,212
Weighted-average yield After 5 to 10 years | 1.21% | 0.51%
Amortized cost After 10 years | $ 245,557 | $ 338,927
Gross Unrealized Gains After 10 years | 25 | 7,091
Gross Unrealized Losses After 10 years | 30,668 | 2,174
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 214,914 | $ 343,844
Weighted-average yield After 10 years | 2.28% | 1.45%
Amortized cost | $ 306,878 | $ 382,914
Gross Unrealized Gain | 26 | 7,743
Gross Unrealized Loss | 35,499 | 2,313
Allowance for Credit Losses | 0 | 0
Fair value | $ 271,405 | $ 388,344
Weighted-average yield | 2.11% | 1.45%
MBS [Member] | FNMA [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost Due within one year | $ 14,565 | $ 4,975
Gross Unrealized Gains Due within one year | 110 | 21
Gross Unrealized Losses Due within one year | 0 | 0
Allowance for Credit Losses within one year | 0 | 0
Fair value Due within one year | $ 14,675 | $ 4,996
Weighted-average yield Due within one year | 3.01% | 2.03%
Amortized cost After 1 to 5 years | $ 10,514 | $ 21,337
Gross Unrealized Gains After 1 to 5 years | 0 | 424
Gross Unrealized Losses After 1 to 5 years | 531 | 0
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 9,983 | $ 21,761
Weighted-average yield After 1 to 5 years | 1.76% | 2.87%
Amortized cost After 5 to 10 years | $ 406,597 | $ 298,771
Gross Unrealized Gains After 5 to 10 years | 0 | 4,387
Gross Unrealized Losses After 5 to 10 years | 40,958 | 1,917
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Fair value After 5 to 10 years | $ 365,639 | $ 301,241
Weighted-average yield After 5 to 10 years | 1.64% | 1.41%
Amortized cost After 10 years | $ 1,230,573 | $ 1,389,381
Gross Unrealized Gains After 10 years | 161 | 8,953
Gross Unrealized Losses After 10 years | 204,452 | 21,747
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 1,026,282 | $ 1,376,587
Weighted-average yield After 10 years | 1.37% | 1.21%
Amortized cost | $ 1,662,249 | $ 1,714,464
Gross Unrealized Gain | 271 | 13,785
Gross Unrealized Loss | 245,941 | 23,664
Allowance for Credit Losses | 0 | 0
Fair value | $ 1,416,579 | $ 1,704,585
Weighted-average yield | 1.45% | 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 | $ 32,101 | $ 24,007
Gross Unrealized Gains After 1 to 5 years | 0 | 1
Gross Unrealized Losses After 1 to 5 years | 4,225 | 778
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 27,876 | $ 23,230
Weighted-average yield After 1 to 5 years | 2.09% | 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 | $ 433,302 | $ 500,811
Gross Unrealized Gains After 10 years | 0 | 290
Gross Unrealized Losses After 10 years | 78,616 | 13,134
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 354,686 | $ 487,967
Weighted-average yield After 10 years | 1.36% | 1.23%
Amortized cost | $ 465,403 | $ 539,134
Gross Unrealized Gain | 0 | 388
Gross Unrealized Loss | 82,841 | 13,912
Allowance for Credit Losses | 0 | 0
Fair value | $ 382,562 | $ 525,610
Weighted-average yield | 1.41% | 1.22%
MBS [Member] | Private label [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost After 10 years | $ 8,611 | $ 9,994
Gross Unrealized Gains After 10 years | 0 | 0
Gross Unrealized Losses After 10 years | 2,151 | 1,963
Allowance for Credit Losses After 10 years | 290 | 797
Fair value After 10 years | $ 6,170 | $ 7,234
Weighted-average yield After 10 years | 5.93% | 2.21%
Gross Unrealized Loss | $ 2,400 |
Allowance for Credit Losses | 300 | $ 800
Fair value | $ 6,200 |
Weighted-average yield | 5.93% |
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 Gain |  | 0
Gross Unrealized Loss |  | 0
Allowance for Credit Losses |  | 0
Fair value |  | $ 1,000
Weighted-average yield |  | 0.78%

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