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DEBT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
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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