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DEBT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 5,863,294	$ 6,398,197
Gross Unrealized Gains	250	247
Gross Unrealized Losses	633,049	798,466
Allowance for Credit Losses	511	458
Fair value	$ 5,229,984	$ 5,599,520
Weighted-average yield	1.24%	1.22%
Accrued interest receivable on loans and investments	$ 77,716	$ 69,730
Available-for-sale Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Allowance for Credit Losses	511	458	$ 1,105	$ 1,310
Accrued interest receivable on loans and investments	10,600	11,100
Federal Home Loan Bank Borrowings [Member] | Asset Pledged as Collateral [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	527,200	286,500
Fair value	477,900	250,600
U.S. Treasury securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	80,314	7,493
Gross Unrealized Gains Due within one year	0	0
Gross Unrealized Losses Due within one year	2,144	309
Allowance for Credit Losses within one year	0	0
Fair value Due within one year	$ 78,170	$ 7,184
Weighted-average yield Due within one year	0.66%	0.22%
Amortized cost After 1 to 5 years	$ 60,239	$ 141,366
Gross Unrealized Gains After 1 to 5 years	0	0
Gross Unrealized Losses After 1 to 5 years	3,016	9,675
Allowance for Credit Losses After 1 to 5 years	0	0
Fair value After 1 to 5 years	$ 57,223	$ 131,691
Weighted-average yield After 1 to 5 years	0.75%	0.70%
U.S. GSE's obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	$ 542,847	$ 129,018
Gross Unrealized Gains Due within one year	0	0
Gross Unrealized Losses Due within one year	15,832	4,036
Allowance for Credit Losses within one year	0	0
Fair value Due within one year	$ 527,015	$ 124,982
Weighted-average yield Due within one year	0.77%	0.32%
Amortized cost After 1 to 5 years	$ 1,899,620	$ 2,395,273
Gross Unrealized Gains After 1 to 5 years	49	22
Gross Unrealized Losses After 1 to 5 years	135,347	227,724
Allowance for Credit Losses After 1 to 5 years	0	0
Fair value After 1 to 5 years	$ 1,764,322	$ 2,167,571
Weighted-average yield After 1 to 5 years	0.86%	0.83%
Amortized cost After 5 to 10 years	$ 8,850	$ 56,251
Gross Unrealized Gains After 5 to 10 years	0	13
Gross Unrealized Losses After 5 to 10 years	687	7,670
Allowance for Credit Losses After 5 to 10 years	0	0
Fair value After 5 to 10 years	$ 8,163	$ 48,594
Weighted-average yield After 5 to 10 years	2.64%	1.54%
Amortized cost After 10 years	$ 8,891	$ 12,170
Gross Unrealized Gains After 10 years	8	36
Gross Unrealized Losses After 10 years	2	0
Allowance for Credit Losses After 10 years	0	0
Fair value After 10 years	$ 8,897	$ 12,206
Weighted-average yield After 10 years	5.49%	4.62%
Puerto Rico government obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost After 10 years	$ 3,156	$ 3,331
Gross Unrealized Gains After 10 years	0	0
Gross Unrealized Losses After 10 years	1,346	755
Allowance for Credit Losses After 10 years	395	375
Fair value After 10 years	$ 1,415	$ 2,201
Weighted-average yield After 10 years	0.00%	0.00%
Allowance for Credit Losses	$ 400	$ 400
Puerto Rico government obligations [Member] | Available-for-sale Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Allowance for Credit Losses	395	375	$ 308	$ 308
United States And Puerto Rico Government Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	2,603,917	2,744,902
Gross Unrealized Gains	57	71
Gross Unrealized Losses	158,374	250,169
Allowance for Credit Losses	395	375
Fair value	$ 2,445,205	$ 2,494,429
Weighted-average yield	0.85%	0.83%
Residential MBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 3,069,139	$ 3,455,864
Gross Unrealized Gains	193	176
Gross Unrealized Losses	436,055	514,499
Allowance for Credit Losses	116	83
Fair value	$ 2,633,161	$ 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	$ 19,561	$ 4,235
Gross Unrealized Gains After 1 to 5 years	0	0
Gross Unrealized Losses After 1 to 5 years	868	169
Allowance for Credit Losses After 1 to 5 years	0	0
Fair value After 1 to 5 years	$ 18,693	$ 4,066
Weighted-average yield After 1 to 5 years	2.06%	2.33%
Amortized cost After 5 to 10 years	$ 153,308	$ 201,072
Gross Unrealized Gains After 5 to 10 years	0	0
Gross Unrealized Losses After 5 to 10 years	12,721	18,709
Allowance for Credit Losses After 5 to 10 years	0	0
Fair value After 5 to 10 years	$ 140,587	$ 182,363
Weighted-average yield After 5 to 10 years	1.55%	1.55%
Amortized cost After 10 years	$ 991,060	$ 1,092,289
Gross Unrealized Gains After 10 years	15	0
Gross Unrealized Losses After 10 years	161,197	186,558
Allowance for Credit Losses After 10 years	0	0
Fair value After 10 years	$ 829,878	$ 905,731
Weighted-average yield After 10 years	1.41%	1.38%
Amortized cost	$ 1,163,929	$ 1,297,596
Gross Unrealized Gains	15	0
Gross Unrealized Losses	174,786	205,436
Allowance for Credit Losses	0	0
Fair value	$ 989,158	$ 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	$ 254	$ 5
Gross Unrealized Gains Due within one year	0	0
Gross Unrealized Losses Due within one year	3	0
Allowance for Credit Losses within one year	0	0
Fair value Due within one year	$ 251	$ 5
Weighted-average yield Due within one year	3.27%	1.73%
Amortized cost After 1 to 5 years	$ 16,882	$ 15,508
Gross Unrealized Gains After 1 to 5 years	0	0
Gross Unrealized Losses After 1 to 5 years	872	622
Allowance for Credit Losses After 1 to 5 years	0	0
Fair value After 1 to 5 years	$ 16,010	$ 14,886
Weighted-average yield After 1 to 5 years	1.19%	2.00%
Amortized cost After 5 to 10 years	$ 27,916	$ 45,322
Gross Unrealized Gains After 5 to 10 years	8	1
Gross Unrealized Losses After 5 to 10 years	2,247	3,809
Allowance for Credit Losses After 5 to 10 years	0	0
Fair value After 5 to 10 years	$ 25,677	$ 41,514
Weighted-average yield After 5 to 10 years	1.62%	1.31%
Amortized cost After 10 years	$ 206,254	$ 232,632
Gross Unrealized Gains After 10 years	87	51
Gross Unrealized Losses After 10 years	22,786	27,169
Allowance for Credit Losses After 10 years	0	0
Fair value After 10 years	$ 183,555	$ 205,514
Weighted-average yield After 10 years	2.57%	2.47%
Amortized cost	$ 251,306	$ 293,467
Gross Unrealized Gains	95	52
Gross Unrealized Losses	25,908	31,600
Allowance for Credit Losses	0	0
Fair value	$ 225,493	$ 261,919
Weighted-average yield	2.38%	2.27%
Residential MBS [Member] | FNMA [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost After 1 to 5 years	$ 32,489	$ 9,685
Gross Unrealized Gains After 1 to 5 years	0	0
Gross Unrealized Losses After 1 to 5 years	1,423	521
Allowance for Credit Losses After 1 to 5 years	0	0
Fair value After 1 to 5 years	$ 31,066	$ 9,164
Weighted-average yield After 1 to 5 years	2.11%	1.76%
Amortized cost After 5 to 10 years	$ 293,492	$ 358,346
Gross Unrealized Gains After 5 to 10 years	0	0
Gross Unrealized Losses After 5 to 10 years	23,146	31,620
Allowance for Credit Losses After 5 to 10 years	0	0
Fair value After 5 to 10 years	$ 270,346	$ 326,726
Weighted-average yield After 5 to 10 years	1.70%	1.68%
Amortized cost After 10 years	$ 1,047,298	$ 1,186,635
Gross Unrealized Gains After 10 years	83	124
Gross Unrealized Losses After 10 years	156,344	186,757
Allowance for Credit Losses After 10 years	0	0
Fair value After 10 years	$ 891,037	$ 1,000,002
Weighted-average yield After 10 years	1.37%	1.38%
Amortized cost	$ 1,373,279	$ 1,554,666
Gross Unrealized Gains	83	124
Gross Unrealized Losses	180,913	218,898
Allowance for Credit Losses	0	0
Fair value	$ 1,192,449	$ 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	$ 273,539	$ 302,232
Gross Unrealized Gains After 10 years	0	0
Gross Unrealized Losses After 10 years	52,263	56,539
Allowance for Credit Losses After 10 years	0	0
Fair value After 10 years	$ 221,276	$ 245,693
Weighted-average yield After 10 years	1.54%	1.44%
Residential MBS [Member] | Private label [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost After 10 years	$ 7,086	$ 7,903
Gross Unrealized Gains After 10 years	0	0
Gross Unrealized Losses After 10 years	2,185	2,026
Allowance for Credit Losses After 10 years	116	83
Fair value After 10 years	$ 4,785	$ 5,794
Weighted-average yield After 10 years	7.66%	6.83%
Allowance for Credit Losses	$ 100	$ 100
Weighted-average yield	7.66%
Commercial Mortgage Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost After 1 to 5 years	$ 45,022	30,578
Gross Unrealized Gains After 1 to 5 years	0	0
Gross Unrealized Losses After 1 to 5 years	6,898	4,463
Allowance for Credit Losses After 1 to 5 years	0	0
Fair value After 1 to 5 years	$ 38,124	$ 26,115
Weighted-average yield After 1 to 5 years	2.17%	2.43%
Amortized cost After 5 to 10 years	$ 22,386	$ 44,889
Gross Unrealized Gains After 5 to 10 years	0	0
Gross Unrealized Losses After 5 to 10 years	2,685	5,603
Allowance for Credit Losses After 5 to 10 years	0	0
Fair value After 5 to 10 years	$ 19,701	$ 39,286
Weighted-average yield After 5 to 10 years	2.16%	1.89%
Amortized cost After 10 years	$ 122,830	$ 121,464
Gross Unrealized Gains After 10 years	0	0
Gross Unrealized Losses After 10 years	29,037	23,732
Allowance for Credit Losses After 10 years	0	0
Fair value After 10 years	$ 93,793	$ 97,732
Weighted-average yield After 10 years	1.36%	1.23%
Amortized cost	$ 190,238	$ 196,931
Gross Unrealized Gains	0	0
Gross Unrealized Losses	38,620	33,798
Allowance for Credit Losses	0	0
Fair value	$ 151,618	$ 163,133
Weighted-average yield	1.64%	1.56%
Mortgage Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 3,259,377	$ 3,652,795
Gross Unrealized Gains	193	176
Gross Unrealized Losses	474,675	548,297
Allowance for Credit Losses	116	83
Fair value	$ 2,784,779	$ 3,104,591
Weighted-average yield	1.55%	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%
Unisured Portion Of Government Deposits [Member] | Asset Pledged as Collateral [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 3,200,000	$ 2,800,000
Fair value	$ 2,800,000	$ 2,400,000

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 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 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
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-Publisher FASB
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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).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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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).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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-Paragraph 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).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
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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

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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 second through fifth 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
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-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 second through fifth 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).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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