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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
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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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