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DEBT SECURITIES - Available-for-Sale Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 4,984,446		$ 5,125,408
Gross Unrealized Gains	5,177		183
Gross Unrealized Losses	390,662		559,768
Allowance for Credit Losses	658	$ 513	521	$ 526	$ 549	$ 511
Fair value	$ 4,598,303		$ 4,565,302
Weighted average yield	2.02%		1.45%
Interest receivable	$ 66,109		$ 71,881
Available-for-Sale Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Interest receivable	9,400		9,600
Federal Home Loan Bank Borrowings [Member] | Asset Pledged as Collateral [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	301,200		533,700
Fair value	264,900		466,100
U.S. Treasury securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	496,714		59,992
Gross Unrealized Gains Due within one year	94		0
Gross Unrealized Losses Due within one year	5		803
Allowance for Credit Losses within one year	0		0
Fair value Due within one year	$ 496,803		$ 59,189
Weighted-average yield Due within one year	4.11%		0.75%
U.S. GSE's obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	$ 775,287		$ 1,090,678
Gross Unrealized Gains Due within one year	25		0
Gross Unrealized Losses Due within one year	6,302		22,826
Allowance for Credit Losses within one year	0		0
Fair value Due within one year	$ 769,010		$ 1,067,852
Weighted-average yield Due within one year	0.80%		0.79%
Amortized cost After 1 to 5 years	$ 506,086		$ 817,835
Gross Unrealized Gains After 1 to 5 years	0		39
Gross Unrealized Losses After 1 to 5 years	22,532		53,195
Allowance for Credit Losses After 1 to 5 years	0		0
Fair value After 1 to 5 years	$ 483,554		$ 764,679
Weighted-average yield After 1 to 5 years	0.92%		0.96%
Amortized cost After 10 years	$ 6,909		$ 7,835
Gross Unrealized Gains After 10 years	0		0
Gross Unrealized Losses After 10 years	59		35
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 6,850		$ 7,800
Weighted-average yield After 10 years	4.47%		4.73%
Puerto Rico government obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost After 10 years	$ 2,753		$ 2,951
Gross Unrealized Gains After 10 years	0		0
Gross Unrealized Losses After 10 years	846		986
Allowance for Credit Losses After 10 years	328		345
Fair value After 10 years	$ 1,579		$ 1,620
Weighted-average yield After 10 years	0.00%		0.00%
Allowance for Credit Losses	$ 328	337	$ 345	350	386	395
United States And Puerto Rico Government Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	1,787,749		1,979,291
Gross Unrealized Gains	119		39
Gross Unrealized Losses	29,744		77,845
Allowance for Credit Losses	328		345
Fair value	$ 1,757,796		$ 1,901,140
Weighted average yield	1.77%		0.87%
Residential MBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 2,961,545		$ 2,922,124
Gross Unrealized Gains	4,854		131
Gross Unrealized Losses	324,314		440,826
Allowance for Credit Losses	330		176
Fair value	$ 2,641,755		$ 2,481,253
Weighted average yield	2.15%		1.79%
Residential MBS [Member] | Freddie Mac (FHLMC) certificates [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	$ 96
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	$ 96
Weighted-average yield Due within one year	2.16%
Amortized cost After 1 to 5 years	$ 9,720		$ 14,477
Gross Unrealized Gains After 1 to 5 years	0		0
Gross Unrealized Losses After 1 to 5 years	189		460
Allowance for Credit Losses After 1 to 5 years	0		0
Fair value After 1 to 5 years	$ 9,531		$ 14,017
Weighted-average yield After 1 to 5 years	2.14%		2.14%
Amortized cost After 5 to 10 years	$ 154,316		$ 122,548
Gross Unrealized Gains After 5 to 10 years	0		0
Gross Unrealized Losses After 5 to 10 years	11,704		9,977
Allowance for Credit Losses After 5 to 10 years	0		0
Fair value After 5 to 10 years	$ 142,612		$ 112,571
Weighted-average yield After 5 to 10 years	1.39%		1.52%
Amortized cost After 10 years	$ 821,743		$ 936,531
Gross Unrealized Gains After 10 years	552		25
Gross Unrealized Losses After 10 years	122,155		168,691
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 700,140		$ 767,865
Weighted-average yield After 10 years	1.60%		1.51%
Amortized cost	$ 985,875		$ 1,073,556
Gross Unrealized Gains	552		25
Gross Unrealized Losses	134,048		179,128
Allowance for Credit Losses	0		0
Fair value	$ 852,379		$ 894,453
Weighted average yield	1.57%		1.52%
Residential MBS [Member] | Ginnie Mae (GNMA) certificates [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	$ 2		$ 881
Gross Unrealized Gains Due within one year	0		0
Gross Unrealized Losses Due within one year	0		6
Allowance for Credit Losses within one year	0		0
Fair value Due within one year	$ 2		$ 875
Weighted-average yield Due within one year	6.14%		2.68%
Amortized cost After 1 to 5 years	$ 4,867		$ 8,025
Gross Unrealized Gains After 1 to 5 years	0		0
Gross Unrealized Losses After 1 to 5 years	139		350
Allowance for Credit Losses After 1 to 5 years	0		0
Fair value After 1 to 5 years	$ 4,728		$ 7,675
Weighted-average yield After 1 to 5 years	0.73%		0.71%
Amortized cost After 5 to 10 years	$ 56,815		$ 67,181
Gross Unrealized Gains After 5 to 10 years	8		0
Gross Unrealized Losses After 5 to 10 years	3,755		6,125
Allowance for Credit Losses After 5 to 10 years	0		0
Fair value After 5 to 10 years	$ 53,068		$ 61,056
Weighted-average yield After 5 to 10 years	1.67%		1.86%
Amortized cost After 10 years	$ 165,106		$ 142,330
Gross Unrealized Gains After 10 years	636		16
Gross Unrealized Losses After 10 years	17,219		22,041
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 148,523		$ 120,305
Weighted-average yield After 10 years	3.37%		2.78%
Amortized cost	$ 226,790		$ 218,417
Gross Unrealized Gains	644		16
Gross Unrealized Losses	21,113		28,522
Allowance for Credit Losses	0		0
Fair value	$ 206,321		$ 189,911
Weighted average yield	2.89%		2.42%
Residential MBS [Member] | Fannie Mae (FNMA) certificates [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	$ 123
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	$ 123
Weighted-average yield Due within one year	1.30%
Amortized cost After 1 to 5 years	$ 14,749		$ 21,921
Gross Unrealized Gains After 1 to 5 years	0		0
Gross Unrealized Losses After 1 to 5 years	280		689
Allowance for Credit Losses After 1 to 5 years	0		0
Fair value After 1 to 5 years	$ 14,469		$ 21,232
Weighted-average yield After 1 to 5 years	2.15%		2.13%
Amortized cost After 5 to 10 years	$ 294,158		$ 244,966
Gross Unrealized Gains After 5 to 10 years	72		0
Gross Unrealized Losses After 5 to 10 years	20,580		18,874
Allowance for Credit Losses After 5 to 10 years	0		0
Fair value After 5 to 10 years	$ 273,650		$ 226,092
Weighted-average yield After 5 to 10 years	1.61%		1.74%
Amortized cost After 10 years	$ 809,915		$ 979,366
Gross Unrealized Gains After 10 years	711		16
Gross Unrealized Losses After 10 years	105,828		159,560
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 704,798		$ 819,822
Weighted-average yield After 10 years	1.56%		1.51%
Amortized cost	$ 1,118,945		$ 1,246,253
Gross Unrealized Gains	783		16
Gross Unrealized Losses	126,688		179,123
Allowance for Credit Losses	0		0
Fair value	$ 993,040		$ 1,067,146
Weighted average yield	1.58%		1.56%
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	$ 624,637		$ 377,812
Gross Unrealized Gains After 10 years	2,875		74
Gross Unrealized Losses After 10 years	40,829		52,338
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 586,683		$ 325,548
Weighted-average yield After 10 years	3.76%		2.88%
Residential MBS [Member] | Private label [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost After 5 to 10 years	$ 5,298		$ 4,886
Gross Unrealized Gains After 5 to 10 years	0		0
Gross Unrealized Losses After 5 to 10 years	1,636		1,430
Allowance for Credit Losses After 5 to 10 years	330		57
Fair value After 5 to 10 years	$ 3,332		$ 3,399
Weighted-average yield After 5 to 10 years	6.25%		6.69%
Amortized cost After 10 years			$ 1,200
Gross Unrealized Gains After 10 years			0
Gross Unrealized Losses After 10 years			285
Allowance for Credit Losses After 10 years			119
Fair value After 10 years			$ 796
Weighted-average yield After 10 years			6.32%
Amortized cost			$ 6,086
Gross Unrealized Gains			0
Gross Unrealized Losses			1,715
Allowance for Credit Losses	$ 330	$ 176	176	$ 176	$ 163	$ 116
Fair value			$ 4,195
Weighted average yield			6.62%
Commercial Mortgage Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost After 1 to 5 years	33,316		$ 33,835
Gross Unrealized Gains After 1 to 5 years	9		13
Gross Unrealized Losses After 1 to 5 years	1,348		2,286
Allowance for Credit Losses After 1 to 5 years	0		0
Fair value After 1 to 5 years	$ 31,977		$ 31,562
Weighted-average yield After 1 to 5 years	2.52%		2.59%
Amortized cost After 5 to 10 years	$ 10,409		$ 10,621
Gross Unrealized Gains After 5 to 10 years	0		0
Gross Unrealized Losses After 5 to 10 years	1,189		1,653
Allowance for Credit Losses After 5 to 10 years	0		0
Fair value After 5 to 10 years	$ 9,220		$ 8,968
Weighted-average yield After 5 to 10 years	1.68%		1.67%
Amortized cost After 10 years	$ 190,927		$ 178,537
Gross Unrealized Gains After 10 years	195		0
Gross Unrealized Losses After 10 years	34,067		37,158
Allowance for Credit Losses After 10 years	0		0
Fair value After 10 years	$ 157,055		$ 141,379
Weighted-average yield After 10 years	2.39%		2.06%
Amortized cost	$ 234,652		$ 222,993
Gross Unrealized Gains	204		13
Gross Unrealized Losses	36,604		41,097
Allowance for Credit Losses	0		0
Fair value	$ 198,252		$ 181,909
Weighted average yield	2.37%		2.12%
Mortgage Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 3,196,197		$ 3,145,117
Gross Unrealized Gains	5,058		144
Gross Unrealized Losses	360,918		481,923
Allowance for Credit Losses	330		176
Fair value	$ 2,840,007		$ 2,663,162
Weighted average yield	2.16%		1.82%
Other Debt Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost Due within one year	$ 500		$ 1,000
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		$ 1,000
Weighted-average yield Due within one year	2.34%		2.32%
Uninsured Portion Of Government Deposits [Member] | Asset Pledged as Collateral [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 3,100,000		$ 3,300,000
Fair value	$ 2,900,000		$ 3,000,000

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 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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- Definition

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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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
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-Topic 320
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-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
-SubTopic 320
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477268/942-320-50-3A

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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
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

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