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DEBT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 5,372,557		$ 5,863,294
Gross Unrealized Gains	1,194		250
Gross Unrealized Losses	478,444		633,049
Allowance for Credit Losses	526	$ 549	511	$ 465	$ 433	$ 458
Fair value	$ 4,894,781		$ 5,229,984
Weighted-average yield	1.26%		1.24%
Interest receivable	$ 67,112		$ 77,716
Available-for-sale Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Interest receivable	9,500		10,600
Federal Home Loan Bank Borrowings [Member] | Asset Pledged as Collateral [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	532,200		527,200
Fair value	475,100		477,900
U.S. Treasury securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	100,140		80,314
Gross Unrealized Gains Due within one year	0		0
Gross Unrealized Losses Due within one year	1,528		2,144
Allowance for Credit Losses within one year	0		0
Fair value Due within one year	$ 98,612		$ 78,170
Weighted-average yield Due within one year	0.74%		0.66%
Amortized cost After 1 to 5 years			$ 60,239
Gross Unrealized Gains After 1 to 5 years			0
Gross Unrealized Losses After 1 to 5 years			3,016
Allowance for Credit Losses After 1 to 5 years			0
Fair value After 1 to 5 years			$ 57,223
Weighted-average yield After 1 to 5 years			0.75%
U.S. GSE's obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	$ 954,478		$ 542,847
Gross Unrealized Gains Due within one year	0		0
Gross Unrealized Losses Due within one year	15,323		15,832
Allowance for Credit Losses within one year	0		0
Fair value Due within one year	$ 939,155		$ 527,015
Weighted-average yield Due within one year	0.83%		0.77%
Amortized cost After 1 to 5 years	$ 1,281,265		$ 1,899,620
Gross Unrealized Gains After 1 to 5 years	51		49
Gross Unrealized Losses After 1 to 5 years	65,467		135,347
Allowance for Credit Losses After 1 to 5 years	0		0
Fair value After 1 to 5 years	$ 1,215,849		$ 1,764,322
Weighted-average yield After 1 to 5 years	0.85%		0.86%
Amortized cost After 5 to 10 years			$ 8,850
Gross Unrealized Gains After 5 to 10 years			0
Gross Unrealized Losses After 5 to 10 years			687
Allowance for Credit Losses After 5 to 10 years			0
Fair value After 5 to 10 years			$ 8,163
Weighted-average yield After 5 to 10 years			2.64%
Amortized cost After 10 years	$ 8,155		$ 8,891
Gross Unrealized Gains After 10 years	10		8
Gross Unrealized Losses After 10 years	4		2
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 8,161		$ 8,897
Weighted-average yield After 10 years	5.21%		5.49%
Puerto Rico government obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost After 10 years	$ 3,008		$ 3,156
Gross Unrealized Gains After 10 years	0		0
Gross Unrealized Losses After 10 years	1,091		1,346
Allowance for Credit Losses After 10 years	350		395
Fair value After 10 years	$ 1,567		$ 1,415
Weighted-average yield After 10 years	0.00%		0.00%
Allowance for Credit Losses	$ 350	$ 386	$ 395	$ 382	$ 350	$ 375
United States And Puerto Rico Government Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	2,347,046		2,603,917
Gross Unrealized Gains	61		57
Gross Unrealized Losses	83,413		158,374
Allowance for Credit Losses	350		395
Fair value	$ 2,263,344		$ 2,445,205
Weighted-average yield	0.85%		0.85%
Residential MBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 2,797,530		$ 3,069,139
Gross Unrealized Gains	632		193
Gross Unrealized Losses	359,454		436,055
Allowance for Credit Losses	176		116
Fair value	$ 2,438,532		$ 2,633,161
Weighted-average yield	1.54%		1.55%
Residential MBS [Member] | Freddie Mac (FHLMC) certificates [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	$ 2
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	$ 2
Weighted-average yield Due within one year	4.04%
Amortized cost After 1 to 5 years	$ 14,626		$ 19,561
Gross Unrealized Gains After 1 to 5 years	0		0
Gross Unrealized Losses After 1 to 5 years	435		868
Allowance for Credit Losses After 1 to 5 years	0		0
Fair value After 1 to 5 years	$ 14,191		$ 18,693
Weighted-average yield After 1 to 5 years	2.06%		2.06%
Amortized cost After 5 to 10 years	$ 131,333		$ 153,308
Gross Unrealized Gains After 5 to 10 years	0		0
Gross Unrealized Losses After 5 to 10 years	8,652		12,721
Allowance for Credit Losses After 5 to 10 years	0		0
Fair value After 5 to 10 years	$ 122,681		$ 140,587
Weighted-average yield After 5 to 10 years	1.54%		1.55%
Amortized cost After 10 years	$ 922,868		$ 991,060
Gross Unrealized Gains After 10 years	34		15
Gross Unrealized Losses After 10 years	135,996		161,197
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 786,906		$ 829,878
Weighted-average yield After 10 years	1.40%		1.41%
Amortized cost	$ 1,068,829		$ 1,163,929
Gross Unrealized Gains	34		15
Gross Unrealized Losses	145,083		174,786
Allowance for Credit Losses	0		0
Fair value	$ 923,780		$ 989,158
Weighted-average yield	1.43%		1.44%
Residential MBS [Member] | Ginnie Mae (GNMA) certificates [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	$ 1,493		$ 254
Gross Unrealized Gains Due within one year	0		0
Gross Unrealized Losses Due within one year	13		3
Allowance for Credit Losses within one year	0		0
Fair value Due within one year	$ 1,480		$ 251
Weighted-average yield Due within one year	2.77%		3.27%
Amortized cost After 1 to 5 years	$ 9,137		$ 16,882
Gross Unrealized Gains After 1 to 5 years	0		0
Gross Unrealized Losses After 1 to 5 years	396		872
Allowance for Credit Losses After 1 to 5 years	0		0
Fair value After 1 to 5 years	$ 8,741		$ 16,010
Weighted-average yield After 1 to 5 years	0.70%		1.19%
Amortized cost After 5 to 10 years	$ 60,779		$ 27,916
Gross Unrealized Gains After 5 to 10 years	7		8
Gross Unrealized Losses After 5 to 10 years	3,846		2,247
Allowance for Credit Losses After 5 to 10 years	0		0
Fair value After 5 to 10 years	$ 56,940		$ 25,677
Weighted-average yield After 5 to 10 years	1.91%		1.62%
Amortized cost After 10 years	$ 155,215		$ 206,254
Gross Unrealized Gains After 10 years	428		87
Gross Unrealized Losses After 10 years	17,212		22,786
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 138,431		$ 183,555
Weighted-average yield After 10 years	2.75%		2.57%
Amortized cost	$ 226,624		$ 251,306
Gross Unrealized Gains	435		95
Gross Unrealized Losses	21,467		25,908
Allowance for Credit Losses	0		0
Fair value	$ 205,592		$ 225,493
Weighted-average yield	2.44%		2.38%
Residential MBS [Member] | Fannie Mae (FNMA) certificates [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost After 1 to 5 years	$ 24,395		$ 32,489
Gross Unrealized Gains After 1 to 5 years	0		0
Gross Unrealized Losses After 1 to 5 years	698		1,423
Allowance for Credit Losses After 1 to 5 years	0		0
Fair value After 1 to 5 years	$ 23,697		$ 31,066
Weighted-average yield After 1 to 5 years	2.12%		2.11%
Amortized cost After 5 to 10 years	$ 258,732		$ 293,492
Gross Unrealized Gains After 5 to 10 years	0		0
Gross Unrealized Losses After 5 to 10 years	15,835		23,146
Allowance for Credit Losses After 5 to 10 years	0		0
Fair value After 5 to 10 years	$ 242,897		$ 270,346
Weighted-average yield After 5 to 10 years	1.74%		1.70%
Amortized cost After 10 years	$ 961,208		$ 1,047,298
Gross Unrealized Gains After 10 years	160		83
Gross Unrealized Losses After 10 years	128,052		156,344
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 833,316		$ 891,037
Weighted-average yield After 10 years	1.35%		1.37%
Amortized cost	$ 1,244,335		$ 1,373,279
Gross Unrealized Gains	160		83
Gross Unrealized Losses	144,585		180,913
Allowance for Credit Losses	0		0
Fair value	$ 1,099,910		$ 1,192,449
Weighted-average yield	1.45%		1.46%
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	$ 251,397		$ 273,539
Gross Unrealized Gains After 10 years	3		0
Gross Unrealized Losses After 10 years	46,471		52,263
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 204,929		$ 221,276
Weighted-average yield After 10 years	1.49%		1.54%
Residential MBS [Member] | Private label [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost After 5 to 10 years	$ 2,528
Gross Unrealized Gains After 5 to 10 years	0
Gross Unrealized Losses After 5 to 10 years	727
Allowance for Credit Losses After 5 to 10 years	7
Fair value After 5 to 10 years	$ 1,794
Weighted-average yield After 5 to 10 years	7.39%
Amortized cost After 10 years	$ 3,817		$ 7,086
Gross Unrealized Gains After 10 years	0		0
Gross Unrealized Losses After 10 years	1,121		2,185
Allowance for Credit Losses After 10 years	169		116
Fair value After 10 years	$ 2,527		$ 4,785
Weighted-average yield After 10 years	6.60%		7.66%
Amortized cost	$ 6,345
Gross Unrealized Gains	0
Gross Unrealized Losses	1,848
Allowance for Credit Losses	176		$ 100
Fair value	$ 4,321
Weighted-average yield	6.92%
Commercial Mortgage Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost After 1 to 5 years	$ 34,010		45,022
Gross Unrealized Gains After 1 to 5 years	9		0
Gross Unrealized Losses After 1 to 5 years	1,879		6,898
Allowance for Credit Losses After 1 to 5 years	0		0
Fair value After 1 to 5 years	$ 32,140		$ 38,124
Weighted-average yield After 1 to 5 years	2.69%		2.17%
Amortized cost After 5 to 10 years	$ 13,241		$ 22,386
Gross Unrealized Gains After 5 to 10 years	0		0
Gross Unrealized Losses After 5 to 10 years	1,464		2,685
Allowance for Credit Losses After 5 to 10 years	0		0
Fair value After 5 to 10 years	$ 11,777		$ 19,701
Weighted-average yield After 5 to 10 years	2.02%		2.16%
Amortized cost After 10 years	$ 179,730		$ 122,830
Gross Unrealized Gains After 10 years	492		0
Gross Unrealized Losses After 10 years	32,234		29,037
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 147,988		$ 93,793
Weighted-average yield After 10 years	2.06%		1.36%
Amortized cost	$ 226,981		$ 190,238
Gross Unrealized Gains	501		0
Gross Unrealized Losses	35,577		38,620
Allowance for Credit Losses	0		0
Fair value	$ 191,905		$ 151,618
Weighted-average yield	2.15%		1.64%
Mortgage Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 3,024,511		$ 3,259,377
Gross Unrealized Gains	1,133		193
Gross Unrealized Losses	395,031		474,675
Allowance for Credit Losses	176		116
Fair value	$ 2,630,437		$ 2,784,779
Weighted-average yield	1.58%		1.55%
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	2.34%
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	2.34%
Amortized cost	$ 1,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Allowance for Credit Losses	0
Fair value	$ 1,000
Weighted-average yield	2.34%
Uninsured Portion Of Government Deposits [Member] | Asset Pledged as Collateral [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 3,000,000		$ 3,200,000
Fair value	$ 2,700,000		$ 2,800,000

X

- 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.

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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 second through fifth 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.

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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 after 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.

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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 next 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.

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Amount before tax of unrealized loss 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.

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Amount before tax of unrealized loss 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 second through fifth 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.

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Amount before tax of unrealized loss 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 after 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.

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Amount before tax of unrealized loss 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 next 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.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (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.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). This represents single maturity date and allocated without single maturity date, maturing in second through fifth 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.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). This represents single maturity date and allocated without single maturity date, maturing after 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.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). This represents single maturity date and allocated without single maturity date, maturing in next 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.

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Weighted average yield of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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

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Amount, before tax, of unrealized loss 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 (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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Amortized cost of 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 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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-Section 50
-Paragraph 3A
-Subparagraph (c)
-Publisher FASB
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