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Allowance for credit losses - Allowance Movement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 769,485	$ 730,077	$ 746,024	$ 729,341
Provision for credit losses (benefit)	74,517	72,769	189,274	189,312
Allowance for credit losses - PCD Loans	6	3	15	26
Charge-offs	(80,560)	(81,276)	(219,918)	(239,748)
Recoveries	22,772	22,747	70,825	65,389
Ending balance	786,220	744,320	786,220	744,320
Allowance for credit losses - unfunded commitments:
Balance at beginning of period	13,053	18,884	15,470	17,006
Provision for credit losses (benefit)	770	(500)	(1,647)	1,378
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	13,823	18,384	13,823	18,384
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	10,579	12,889	11,264	12,686
Provision for credit losses (benefit)	525	(711)	(160)	(608)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	1,036	0	1,136
Ending balance	11,104	13,214	11,104	13,214
Allowance for credit losses - unfunded commitments:
Balance at beginning of period	5,158	10,494	7,072	10,064
Provision for credit losses (benefit)	(227)	(236)	(2,141)	194
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	4,931	10,258	4,931	10,258
Mortgages
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	85,175	83,289	82,409	83,214
Provision for credit losses (benefit)	(452)	(5,582)	(2,838)	(13,747)
Allowance for credit losses - PCD Loans	6	3	15	26
Charge-offs	(585)	(208)	(1,570)	(1,017)
Recoveries	2,837	4,148	8,965	13,174
Ending balance	86,981	81,650	86,981	81,650
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	266,311	260,087	259,564	258,413
Provision for credit losses (benefit)	41,330	9,986	46,265	25,176
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(17,013)	(6,928)	(24,765)	(26,654)
Recoveries	3,297	3,403	12,861	9,613
Ending balance	293,925	266,548	293,925	266,548
Allowance for credit losses - unfunded commitments:
Balance at beginning of period	7,811	8,390	8,387	6,913
Provision for credit losses (benefit)	936	(264)	360	1,213
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	8,747	8,126	8,747	8,126
Commercial | Commercial multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	16,781	11,180	9,236	13,740
Provision for credit losses (benefit)	(261)	(1,543)	7,838	(3,668)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	(563)	(441)
Recoveries	62	5	71	11
Ending balance	16,582	9,642	16,582	9,642
Commercial | CRE non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	59,117	64,235	54,494	65,453
Provision for credit losses (benefit)	12,342	3,397	15,919	1,704
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(13,490)	(123)	(13,576)	(123)
Recoveries	876	121	2,008	596
Ending balance	58,845	67,630	58,845	67,630
Commercial | CRE owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	49,051	58,190	49,828	56,864
Provision for credit losses (benefit)	(823)	(6,848)	(3,548)	(4,492)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	(2)	(129)	(2,787)
Recoveries	963	1,575	3,040	3,330
Ending balance	49,191	52,915	49,191	52,915
Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	141,362	126,482	146,006	122,356
Provision for credit losses (benefit)	30,072	14,980	26,056	31,632
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(3,523)	(6,803)	(10,497)	(23,303)
Recoveries	1,396	1,702	7,742	5,676
Ending balance	169,307	136,361	169,307	136,361
Leasing
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	20,040	14,385	16,419	9,708
Provision for credit losses (benefit)	1,234	3,725	10,863	14,787
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(4,017)	(3,630)	(12,543)	(12,321)
Recoveries	1,963	1,374	4,481	3,680
Ending balance	19,220	15,854	19,220	15,854
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	387,380	359,427	376,368	365,320
Provision for credit losses (benefit)	31,880	65,351	135,144	163,704
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(58,945)	(70,510)	(181,040)	(199,756)
Recoveries	14,675	12,786	44,518	37,786
Ending balance	374,990	367,054	374,990	367,054
Allowance for credit losses - unfunded commitments:
Balance at beginning of period	84		11	29
Provision for credit losses (benefit)	61		134	(29)
Allowance for credit losses - PCD Loans	0		0	0
Charge-offs	0		0	0
Recoveries	0		0	0
Balance at end of period	145	0	145	0
Consumer | Credit card
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	92,306	86,313	99,130	80,487
Provision for credit losses (benefit)	10,212	21,238	37,128	54,734
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(18,139)	(17,503)	(57,015)	(50,318)
Recoveries	2,829	2,646	7,965	7,791
Ending balance	87,208	92,694	87,208	92,694
Consumer | HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,384	1,726	1,503	1,978
Provision for credit losses (benefit)	(348)	(68)	(1,704)	(706)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	(86)	(71)	(398)
Recoveries	512	282	1,820	980
Ending balance	1,548	1,854	1,548	1,854
Consumer | Personal loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	103,654	107,448	102,736	117,790
Provision for credit losses (benefit)	13,378	23,031	52,704	64,572
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(20,847)	(29,154)	(67,899)	(87,104)
Recoveries	4,053	3,217	12,697	9,284
Ending balance	100,238	104,542	100,238	104,542
Consumer | Auto Loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	182,274	157,449	165,995	157,931
Provision for credit losses (benefit)	7,581	20,765	43,904	44,386
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(19,175)	(23,011)	(53,649)	(59,787)
Recoveries	7,139	6,110	21,569	18,783
Ending balance	177,819	161,313	177,819	161,313
Consumer | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	7,762	6,491	7,004	7,134
Provision for credit losses (benefit)	1,057	385	3,112	718
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(784)	(756)	(2,406)	(2,149)
Recoveries	142	531	467	948
Ending balance	8,177	6,651	8,177	6,651
Puerto Rico
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	679,249	643,605	670,666	639,858
Provision for credit losses (benefit)	72,639	77,147	168,479	186,740
Allowance for credit losses - PCD Loans	6	3	15	26
Charge-offs	(78,184)	(76,135)	(210,123)	(222,011)
Recoveries	21,645	21,554	66,318	61,561
Ending balance	695,355	666,174	695,355	666,174
Allowance for credit losses - unfunded commitments:
Balance at beginning of period	7,745	7,635	8,388	6,680
Provision for credit losses (benefit)	816	1,189	173	2,144
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	8,561	8,824	8,561	8,824
Puerto Rico | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,075	3,638	2,743	5,294
Provision for credit losses (benefit)	370	(970)	702	(2,626)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	1,036	0	1,036
Ending balance	3,445	3,704	3,445	3,704
Allowance for credit losses - unfunded commitments:
Balance at beginning of period	1,869	2,095	1,663	1,618
Provision for credit losses (benefit)	(127)	373	79	850
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	1,742	2,468	1,742	2,468
Puerto Rico | Mortgages
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	74,966	73,900	72,901	72,440
Provision for credit losses (benefit)	337	(5,221)	(2,533)	(11,959)
Allowance for credit losses - PCD Loans	6	3	15	26
Charge-offs	(585)	(208)	(1,570)	(999)
Recoveries	2,801	4,102	8,712	13,068
Ending balance	77,525	72,576	77,525	72,576
Puerto Rico | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	205,885	207,327	215,126	205,582
Provision for credit losses (benefit)	38,763	17,106	26,965	30,724
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(16,291)	(6,261)	(22,258)	(23,787)
Recoveries	3,159	3,076	11,683	8,729
Ending balance	231,516	221,248	231,516	221,248
Allowance for credit losses - unfunded commitments:
Balance at beginning of period	5,876	5,540	6,725	5,062
Provision for credit losses (benefit)	943	816	94	1,294
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	6,819	6,356	6,819	6,356
Puerto Rico | Commercial | Commercial multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,696	3,303	2,783	3,614
Provision for credit losses (benefit)	(177)	(417)	728	(729)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	2	0	10	1
Ending balance	3,521	2,886	3,521	2,886
Puerto Rico | Commercial | CRE non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	43,139	53,386	44,852	53,754
Provision for credit losses (benefit)	10,931	3,344	8,172	2,607
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(13,490)	(69)	(13,576)	(69)
Recoveries	876	59	2,008	428
Ending balance	41,456	56,720	41,456	56,720
Puerto Rico | Commercial | CRE owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	35,848	39,375	37,355	40,637
Provision for credit losses (benefit)	(2,211)	(2,418)	(5,129)	(2,567)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	(2)	(103)	(2,787)
Recoveries	947	1,556	2,461	3,228
Ending balance	34,584	38,511	34,584	38,511
Puerto Rico | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	123,202	111,263	130,136	107,577
Provision for credit losses (benefit)	30,220	16,597	23,194	31,413
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(2,801)	(6,190)	(8,579)	(20,931)
Recoveries	1,334	1,461	7,204	5,072
Ending balance	151,955	123,131	151,955	123,131
Puerto Rico | Leasing
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	20,040	14,385	16,419	9,708
Provision for credit losses (benefit)	1,234	3,725	10,863	14,787
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(4,017)	(3,630)	(12,543)	(12,321)
Recoveries	1,963	1,374	4,481	3,680
Ending balance	19,220	15,854	19,220	15,854
Puerto Rico | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	375,283	344,355	363,477	346,834
Provision for credit losses (benefit)	31,935	62,507	132,482	155,814
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(57,291)	(66,036)	(173,752)	(184,904)
Recoveries	13,722	11,966	41,442	35,048
Ending balance	363,649	352,792	363,649	352,792
Puerto Rico | Consumer | Credit card
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	92,306	86,313	99,130	80,487
Provision for credit losses (benefit)	10,212	21,238	37,128	54,734
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(18,139)	(17,503)	(57,015)	(50,318)
Recoveries	2,829	2,646	7,965	7,791
Ending balance	87,208	92,694	87,208	92,694
Puerto Rico | Consumer | HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	54	83	54	103
Provision for credit losses (benefit)	(95)	(90)	(516)	35
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	(82)	(25)	(373)
Recoveries	89	158	535	304
Ending balance	48	69	48	69
Puerto Rico | Consumer | Personal loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	92,891	94,021	91,296	101,181
Provision for credit losses (benefit)	13,195	20,232	48,904	55,987
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(19,218)	(24,712)	(60,724)	(72,354)
Recoveries	3,533	2,526	10,925	7,253
Ending balance	90,401	92,067	90,401	92,067
Puerto Rico | Consumer | Auto Loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	182,274	157,449	165,995	157,931
Provision for credit losses (benefit)	7,581	20,765	43,904	44,386
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(19,175)	(23,011)	(53,649)	(59,787)
Recoveries	7,139	6,110	21,569	18,783
Ending balance	177,819	161,313	177,819	161,313
Puerto Rico | Consumer | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	7,758	6,489	7,002	7,132
Provision for credit losses (benefit)	1,042	362	3,062	672
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(759)	(728)	(2,339)	(2,072)
Recoveries	132	526	448	917
Ending balance	8,173	6,649	8,173	6,649
Popular U.S.
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	90,236	86,472	75,358	89,483
Provision for credit losses (benefit)	1,878	(4,378)	20,795	2,572
Charge-offs	(2,376)	(5,141)	(9,795)	(17,737)
Recoveries	1,127	1,193	4,507	3,828
Ending balance	90,865	78,146	90,865	78,146
Allowance for credit losses - unfunded commitments:
Balance at beginning of period	5,308	11,249	7,082	10,326
Provision for credit losses (benefit)	(46)	(1,689)	(1,820)	(766)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	5,262	9,560	5,262	9,560
Popular U.S. | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	7,504	9,251	8,521	7,392
Provision for credit losses (benefit)	155	259	(862)	2,018
Charge-offs	0	0	0	0
Recoveries	0	0	0	100
Ending balance	7,659	9,510	7,659	9,510
Allowance for credit losses - unfunded commitments:
Balance at beginning of period	3,289	8,399	5,409	8,446
Provision for credit losses (benefit)	(100)	(609)	(2,220)	(656)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	3,189	7,790	3,189	7,790
Popular U.S. | Mortgages
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	10,209	9,389	9,508	10,774
Provision for credit losses (benefit)	(789)	(361)	(305)	(1,788)
Charge-offs	0	0	0	(18)
Recoveries	36	46	253	106
Ending balance	9,456	9,074	9,456	9,074
Popular U.S. | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	60,426	52,760	44,438	52,831
Provision for credit losses (benefit)	2,567	(7,120)	19,300	(5,548)
Charge-offs	(722)	(667)	(2,507)	(2,867)
Recoveries	138	327	1,178	884
Ending balance	62,409	45,300	62,409	45,300
Allowance for credit losses - unfunded commitments:
Balance at beginning of period	1,935	2,850	1,662	1,851
Provision for credit losses (benefit)	(7)	(1,080)	266	(81)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	1,928	1,770	1,928	1,770
Popular U.S. | Commercial | Commercial multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	13,085	7,877	6,453	10,126
Provision for credit losses (benefit)	(84)	(1,126)	7,110	(2,939)
Charge-offs	0	0	(563)	(441)
Recoveries	60	5	61	10
Ending balance	13,061	6,756	13,061	6,756
Popular U.S. | Commercial | CRE non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	15,978	10,849	9,642	11,699
Provision for credit losses (benefit)	1,411	53	7,747	(903)
Charge-offs	0	(54)	0	(54)
Recoveries	0	62	0	168
Ending balance	17,389	10,910	17,389	10,910
Popular U.S. | Commercial | CRE owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	13,203	18,815	12,473	16,227
Provision for credit losses (benefit)	1,388	(4,430)	1,581	(1,925)
Charge-offs	0	0	(26)	0
Recoveries	16	19	579	102
Ending balance	14,607	14,404	14,607	14,404
Popular U.S. | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	18,160	15,219	15,870	14,779
Provision for credit losses (benefit)	(148)	(1,617)	2,862	219
Charge-offs	(722)	(613)	(1,918)	(2,372)
Recoveries	62	241	538	604
Ending balance	17,352	13,230	17,352	13,230
Popular U.S. | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	12,097	15,072	12,891	18,486
Provision for credit losses (benefit)	(55)	2,844	2,662	7,890
Charge-offs	(1,654)	(4,474)	(7,288)	(14,852)
Recoveries	953	820	3,076	2,738
Ending balance	11,341	14,262	11,341	14,262
Allowance for credit losses - unfunded commitments:
Balance at beginning of period	84		11	29
Provision for credit losses (benefit)	61		134	(29)
Charge-offs	0		0	0
Recoveries	0		0	0
Balance at end of period	145	0	145	0
Popular U.S. | Consumer | HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,330	1,643	1,449	1,875
Provision for credit losses (benefit)	(253)	22	(1,188)	(741)
Charge-offs	0	(4)	(46)	(25)
Recoveries	423	124	1,285	676
Ending balance	1,500	1,785	1,500	1,785
Popular U.S. | Consumer | Personal loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	10,763	13,427	11,440	16,609
Provision for credit losses (benefit)	183	2,799	3,800	8,585
Charge-offs	(1,629)	(4,442)	(7,175)	(14,750)
Recoveries	520	691	1,772	2,031
Ending balance	9,837	12,475	9,837	12,475
Popular U.S. | Consumer | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	4	2	2	2
Provision for credit losses (benefit)	15	23	50	46
Charge-offs	(25)	(28)	(67)	(77)
Recoveries	10	5	19	31
Ending balance	$ 4	$ 2	$ 4	$ 2

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