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DEBT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Amortized cost | $ 6,199,630 |  | $ 6,398,197 |  |  |
Gross Unrealized Gains | 127 |  | 247 |  |  |
Gross Unrealized Losses | 765,955 |  | 798,466 |  |  |
Allowance for Credit Losses | 433 | $ 449 | 458 | $ 676 | $ 711 | $ 1,105
Fair value | $ 5,433,369 |  | $ 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 | 27,671 |  | 7,493 |  |  |
Gross Unrealized Gains Due within one year | 0 |  | 0 |  |  |
Gross Unrealized Losses Due within one year | 705 |  | 309 |  |  |
Allowance for Credit Losses within one year | 0 |  | 0 |  |  |
Fair value Due within one year | $ 26,966 |  | $ 7,184 |  |  |
Weighted-average yield Due within one year | 0.61% |  | 0.22% |  |  |
Amortized cost After 1 to 5 years | $ 120,787 |  | $ 141,366 |  |  |
Gross Unrealized Gains After 1 to 5 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 1 to 5 years | 8,084 |  | 9,675 |  |  |
Allowance for Credit Losses After 1 to 5 years | 0 |  | 0 |  |  |
Fair value After 1 to 5 years | $ 112,703 |  | $ 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 | $ 224,161 |  | $ 129,018 |  |  |
Gross Unrealized Gains Due within one year | 0 |  | 0 |  |  |
Gross Unrealized Losses Due within one year | 5,089 |  | 4,036 |  |  |
Allowance for Credit Losses within one year | 0 |  | 0 |  |  |
Fair value Due within one year | $ 219,072 |  | $ 124,982 |  |  |
Weighted-average yield Due within one year | 0.42% |  | 0.32% |  |  |
Amortized cost After 1 to 5 years | $ 2,344,874 |  | $ 2,395,273 |  |  |
Gross Unrealized Gains After 1 to 5 years | 56 |  | 22 |  |  |
Gross Unrealized Losses After 1 to 5 years | 209,839 |  | 227,724 |  |  |
Allowance for Credit Losses After 1 to 5 years | 0 |  | 0 |  |  |
Fair value After 1 to 5 years | $ 2,135,091 |  | $ 2,167,571 |  |  |
Weighted-average yield After 1 to 5 years | 0.85% |  | 0.83% |  |  |
Amortized cost After 5 to 10 years | $ 11,267 |  | $ 56,251 |  |  |
Gross Unrealized Gains After 5 to 10 years | 4 |  | 13 |  |  |
Gross Unrealized Losses After 5 to 10 years | 871 |  | 7,670 |  |  |
Allowance for Credit Losses After 5 to 10 years | 0 |  | 0 |  |  |
Fair value After 5 to 10 years | $ 10,400 |  | $ 48,594 |  |  |
Weighted-average yield After 5 to 10 years | 3.16% |  | 1.54% |  |  |
Amortized cost After 10 years | $ 10,844 |  | $ 12,170 |  |  |
Gross Unrealized Gains After 10 years | 22 |  | 36 |  |  |
Gross Unrealized Losses After 10 years | 1 |  | 0 |  |  |
Allowance for Credit Losses After 10 years | 0 |  | 0 |  |  |
Fair value After 10 years | $ 10,865 |  | $ 12,206 |  |  |
Weighted-average yield After 10 years | 5.38% |  | 4.62% |  |  |
Puerto Rico government obligations [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Amortized cost After 10 years | $ 3,254 |  | $ 3,331 |  |  |
Gross Unrealized Gains After 10 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 10 years | 794 |  | 755 |  |  |
Allowance for Credit Losses After 10 years | 349 |  | 375 |  |  |
Fair value After 10 years | $ 2,111 |  | $ 2,201 |  |  |
Weighted-average yield After 10 years | 0.00% |  | 0.00% |  |  |
Allowance for Credit Losses | $ 350 | $ 366 | $ 375 | $ 386 | $ 308 | $ 308
United States And Puerto Rico Government Obligations [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Amortized cost | 2,742,858 |  | 2,744,902 |  |  |
Gross Unrealized Gains | 82 |  | 71 |  |  |
Gross Unrealized Losses | 225,383 |  | 250,169 |  |  |
Allowance for Credit Losses | 349 |  | 375 |  |  |
Fair value | $ 2,517,208 |  | $ 2,494,429 |  |  |
Weighted-average yield | 0.83% |  | 0.83% |  |  |
Residential MBS [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Amortized cost | $ 3,261,603 |  | $ 3,455,864 |  |  |
Gross Unrealized Gains | 45 |  | 176 |  |  |
Gross Unrealized Losses | 501,867 |  | 514,499 |  |  |
Allowance for Credit Losses | 84 |  | 83 |  |  |
Fair value | $ 2,759,697 |  | $ 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 | $ 20,047 |  | $ 4,235 |  |  |
Gross Unrealized Gains After 1 to 5 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 1 to 5 years | 1,191 |  | 169 |  |  |
Allowance for Credit Losses After 1 to 5 years | 0 |  | 0 |  |  |
Fair value After 1 to 5 years | $ 18,856 |  | $ 4,066 |  |  |
Weighted-average yield After 1 to 5 years | 1.97% |  | 2.33% |  |  |
Amortized cost After 5 to 10 years | $ 171,682 |  | $ 201,072 |  |  |
Gross Unrealized Gains After 5 to 10 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 5 to 10 years | 17,242 |  | 18,709 |  |  |
Allowance for Credit Losses After 5 to 10 years | 0 |  | 0 |  |  |
Fair value After 5 to 10 years | $ 154,440 |  | $ 182,363 |  |  |
Weighted-average yield After 5 to 10 years | 1.58% |  | 1.55% |  |  |
Amortized cost After 10 years | $ 1,038,513 |  | $ 1,092,289 |  |  |
Gross Unrealized Gains After 10 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 10 years | 180,505 |  | 186,558 |  |  |
Allowance for Credit Losses After 10 years | 0 |  | 0 |  |  |
Fair value After 10 years | $ 858,008 |  | $ 905,731 |  |  |
Weighted-average yield After 10 years | 1.41% |  | 1.38% |  |  |
Amortized cost | $ 1,230,242 |  | $ 1,297,596 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized Losses | 198,938 |  | 205,436 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair value | $ 1,031,304 |  | $ 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 | $ 1 |  | $ 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 | $ 1 |  | $ 5 |  |  |
Weighted-average yield Due within one year | 2.53% |  | 1.73% |  |  |
Amortized cost After 1 to 5 years | $ 20,426 |  | $ 15,508 |  |  |
Gross Unrealized Gains After 1 to 5 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 1 to 5 years | 1,257 |  | 622 |  |  |
Allowance for Credit Losses After 1 to 5 years | 0 |  | 0 |  |  |
Fair value After 1 to 5 years | $ 19,169 |  | $ 14,886 |  |  |
Weighted-average yield After 1 to 5 years | 1.25% |  | 2.00% |  |  |
Amortized cost After 5 to 10 years | $ 32,172 |  | $ 45,322 |  |  |
Gross Unrealized Gains After 5 to 10 years | 0 |  | 1 |  |  |
Gross Unrealized Losses After 5 to 10 years | 2,952 |  | 3,809 |  |  |
Allowance for Credit Losses After 5 to 10 years | 0 |  | 0 |  |  |
Fair value After 5 to 10 years | $ 29,220 |  | $ 41,514 |  |  |
Weighted-average yield After 5 to 10 years | 1.70% |  | 1.31% |  |  |
Amortized cost After 10 years | $ 219,768 |  | $ 232,632 |  |  |
Gross Unrealized Gains After 10 years | 7 |  | 51 |  |  |
Gross Unrealized Losses After 10 years | 26,660 |  | 27,169 |  |  |
Allowance for Credit Losses After 10 years | 0 |  | 0 |  |  |
Fair value After 10 years | $ 193,115 |  | $ 205,514 |  |  |
Weighted-average yield After 10 years | 2.63% |  | 2.47% |  |  |
Amortized cost | $ 272,367 |  | $ 293,467 |  |  |
Gross Unrealized Gains | 7 |  | 52 |  |  |
Gross Unrealized Losses | 30,869 |  | 31,600 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair value | $ 241,505 |  | $ 261,919 |  |  |
Weighted-average yield | 2.42% |  | 2.27% |  |  |
Residential MBS [Member] | FNMA [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Amortized cost After 1 to 5 years | $ 22,434 |  | $ 9,685 |  |  |
Gross Unrealized Gains After 1 to 5 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 1 to 5 years | 1,399 |  | 521 |  |  |
Allowance for Credit Losses After 1 to 5 years | 0 |  | 0 |  |  |
Fair value After 1 to 5 years | $ 21,035 |  | $ 9,164 |  |  |
Weighted-average yield After 1 to 5 years | 1.72% |  | 1.76% |  |  |
Amortized cost After 5 to 10 years | $ 338,605 |  | $ 358,346 |  |  |
Gross Unrealized Gains After 5 to 10 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 5 to 10 years | 31,862 |  | 31,620 |  |  |
Allowance for Credit Losses After 5 to 10 years | 0 |  | 0 |  |  |
Fair value After 5 to 10 years | $ 306,743 |  | $ 326,726 |  |  |
Weighted-average yield After 5 to 10 years | 1.75% |  | 1.68% |  |  |
Amortized cost After 10 years | $ 1,102,263 |  | $ 1,186,635 |  |  |
Gross Unrealized Gains After 10 years | 38 |  | 124 |  |  |
Gross Unrealized Losses After 10 years | 178,364 |  | 186,757 |  |  |
Allowance for Credit Losses After 10 years | 0 |  | 0 |  |  |
Fair value After 10 years | $ 923,937 |  | $ 1,000,002 |  |  |
Weighted-average yield After 10 years | 1.37% |  | 1.38% |  |  |
Amortized cost | $ 1,463,302 |  | $ 1,554,666 |  |  |
Gross Unrealized Gains | 38 |  | 124 |  |  |
Gross Unrealized Losses | 211,625 |  | 218,898 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair value | $ 1,251,715 |  | $ 1,335,892 |  |  |
Weighted-average yield | 1.46% |  | 1.45% |  |  |
Residential MBS [Member] | Collateralized mortgage obligations ("CMOs") issued or guaranteed by FHLMC, FNMA and GNMA [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Amortized cost After 10 years | $ 288,194 |  | $ 302,232 |  |  |
Gross Unrealized Gains After 10 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 10 years | 58,267 |  | 56,539 |  |  |
Allowance for Credit Losses After 10 years | 0 |  | 0 |  |  |
Fair value After 10 years | $ 229,927 |  | $ 245,693 |  |  |
Weighted-average yield After 10 years | 1.48% |  | 1.44% |  |  |
Residential MBS [Member] | Private label [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Amortized cost After 10 years | $ 7,498 |  | $ 7,903 |  |  |
Gross Unrealized Gains After 10 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 10 years | 2,168 |  | 2,026 |  |  |
Allowance for Credit Losses After 10 years | 84 |  | 83 |  |  |
Fair value After 10 years | $ 5,246 |  | $ 5,794 |  |  |
Weighted-average yield After 10 years | 7.61% |  | 6.83% |  |  |
Allowance for Credit Losses | $ 100 |  | $ 100 |  |  |
Weighted-average yield | 7.60% |  |  |  |  |
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Amortized cost After 1 to 5 years | $ 44,311 |  | 30,578 |  |  |
Gross Unrealized Gains After 1 to 5 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 1 to 5 years | 7,308 |  | 4,463 |  |  |
Allowance for Credit Losses After 1 to 5 years | 0 |  | 0 |  |  |
Fair value After 1 to 5 years | $ 37,003 |  | $ 26,115 |  |  |
Weighted-average yield After 1 to 5 years | 2.15% |  | 2.43% |  |  |
Amortized cost After 5 to 10 years | $ 25,656 |  | $ 44,889 |  |  |
Gross Unrealized Gains After 5 to 10 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 5 to 10 years | 3,430 |  | 5,603 |  |  |
Allowance for Credit Losses After 5 to 10 years | 0 |  | 0 |  |  |
Fair value After 5 to 10 years | $ 22,226 |  | $ 39,286 |  |  |
Weighted-average yield After 5 to 10 years | 2.13% |  | 1.89% |  |  |
Amortized cost After 10 years | $ 125,202 |  | $ 121,464 |  |  |
Gross Unrealized Gains After 10 years | 0 |  | 0 |  |  |
Gross Unrealized Losses After 10 years | 27,967 |  | 23,732 |  |  |
Allowance for Credit Losses After 10 years | 0 |  | 0 |  |  |
Fair value After 10 years | $ 97,235 |  | $ 97,732 |  |  |
Weighted-average yield After 10 years | 1.40% |  | 1.23% |  |  |
Amortized cost | $ 195,169 |  | $ 196,931 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized Losses | 38,705 |  | 33,798 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair value | $ 156,464 |  | $ 163,133 |  |  |
Weighted-average yield | 1.67% |  | 1.56% |  |  |
Mortgage Backed Securities [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Amortized cost | $ 3,456,772 |  | $ 3,652,795 |  |  |
Gross Unrealized Gains | 45 |  | 176 |  |  |
Gross Unrealized Losses | 540,572 |  | 548,297 |  |  |
Allowance for Credit Losses | 84 |  | 83 |  |  |
Fair value | $ 2,916,161 |  | $ 3,104,591 |  |  |
Weighted-average yield | 1.56% |  | 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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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. This represents single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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