Allowance for credit losses - loans held-in-portfolio - Schedule of Changes in the ACL of Loans Held-in-Portfolio and Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Allowance for credit losses - loans:
Beginning Balance	$ 823,729	$ 762,148	$ 808,056	$ 746,024	$ 746,024
Provision for credit losses (benefit)	65,154	49,539	140,843	114,757
Allowance for credit losses - PCD Loans	2	0	9	9
Charge-offs	(132,790)	(64,290)	(214,953)	(139,358)
Recoveries	28,737	22,088	50,877	48,053
Ending Balance	784,832	769,485	784,832	769,485	808,056
Allowance for credit losses - unfunded commitments:
Beginning Balance	14,547	14,169	14,438	15,470	15,470
Provision for credit losses (benefit)	389	(1,116)	498	(2,417)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	14,936	13,053	14,936	13,053	14,438
Construction
Allowance for credit losses - loans:
Beginning Balance	15,160	9,512	13,826	11,264	11,264
Provision for credit losses (benefit)	(800)	1,067	523	(685)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	11	0
Ending Balance	14,360	10,579	14,360	10,579	13,826
Allowance for credit losses - unfunded commitments:
Beginning Balance	7,230	5,052	6,731	7,072	7,072
Provision for credit losses (benefit)	(1,120)	106	(621)	(1,914)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	6,110	5,158	6,110	5,158	6,731
Mortgage
Allowance for credit losses - loans:
Beginning Balance	83,624	84,029	80,554	82,409	82,409
Provision for credit losses (benefit)	(9,057)	(1,315)	(8,338)	(2,386)
Allowance for credit losses - PCD Loans	2	0	9	9
Charge-offs	(32)	(550)	(534)	(985)	(1,436)
Recoveries	4,985	3,011	7,831	6,128
Ending Balance	79,522	85,175	79,522	85,175	80,554
Commercial
Allowance for credit losses - loans:
Beginning Balance	332,807	269,843	307,447	259,564	259,564
Provision for credit losses (benefit)	48,458	(3,226)	85,177	4,935
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(77,075)	(3,127)	(90,944)	(7,752)
Recoveries	8,574	2,821	11,084	9,564
Ending Balance	312,764	266,311	312,764	266,311	307,447
Allowance for credit losses - unfunded commitments:
Beginning Balance	7,192	9,075	7,563	8,387	8,387
Provision for credit losses (benefit)	1,499	(1,264)	1,128	(576)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	8,691	7,811	8,691	7,811	7,563
Commercial | Commercial multi-family
Allowance for credit losses - loans:
Beginning Balance	20,069	13,501	19,345	9,236	9,236
Provision for credit losses (benefit)	162	3,837	884	8,099
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(1,312)	(563)	(1,312)	(563)	(563)
Recoveries	0	6	2	9
Ending Balance	18,919	16,781	18,919	16,781	19,345
Commercial | Commercial real estate Non-owner occupied
Allowance for credit losses - loans:
Beginning Balance	64,146	58,301	58,717	54,494	54,494
Provision for credit losses (benefit)	(12,438)	365	4,106	3,577
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(743)	(21)	(11,874)	(86)	(13,576)
Recoveries	4,845	472	4,861	1,132
Ending Balance	55,810	59,117	55,810	59,117	58,717
Commercial | Commercial real estate Owner occupied
Allowance for credit losses - loans:
Beginning Balance	51,116	50,212	48,451	49,828	49,828
Provision for credit losses (benefit)	(679)	(2,192)	1,516	(2,725)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	(28)	(91)	(129)	(390)
Recoveries	2,202	1,059	2,763	2,077
Ending Balance	52,639	49,051	52,639	49,051	48,451
Commercial | Commercial and industrial
Allowance for credit losses - loans:
Beginning Balance	197,476	147,829	180,934	146,006	146,006
Provision for credit losses (benefit)	61,413	(5,236)	78,671	(4,016)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(75,020)	(2,515)	(77,667)	(6,974)	(17,190)
Recoveries	1,527	1,284	3,458	6,346
Ending Balance	185,396	141,362	185,396	141,362	180,934
Leasing
Allowance for credit losses - loans:
Beginning Balance	18,588	20,206	18,620	16,419	16,419
Provision for credit losses (benefit)	879	2,570	3,416	9,629
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(3,342)	(3,982)	(7,427)	(8,526)	(16,856)
Recoveries	1,502	1,246	3,018	2,518
Ending Balance	17,627	20,040	17,627	20,040	18,620
Consumer
Allowance for credit losses - loans:
Beginning Balance	373,550	378,558	387,609	376,368	376,368
Provision for credit losses (benefit)	25,674	50,443	60,065	103,264
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(52,341)	(56,631)	(116,048)	(122,095)
Recoveries	13,676	15,010	28,933	29,843
Ending Balance	360,559	387,380	360,559	387,380	387,609
Allowance for credit losses - unfunded commitments:
Beginning Balance	125	42	144	11	11
Provision for credit losses (benefit)	10	42	(9)	73
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	135	84	135	84	144
Consumer | Credit cards
Allowance for credit losses - loans:
Beginning Balance	89,376	96,523	91,124	99,130	99,130
Provision for credit losses (benefit)	9,742	13,094	24,047	26,916
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(17,723)	(20,011)	(36,958)	(38,876)	(75,428)
Recoveries	3,422	2,700	6,604	5,136
Ending Balance	84,817	92,306	84,817	92,306	91,124
Consumer | Home equity lines of credit
Allowance for credit losses - loans:
Beginning Balance	1,178	1,610	1,335	1,503	1,503
Provision for credit losses (benefit)	95	(1,112)	(387)	(1,356)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(29)	(16)	(29)	(71)	(109)
Recoveries	179	902	504	1,308
Ending Balance	1,423	1,384	1,423	1,384	1,335
Consumer | Personal
Allowance for credit losses - loans:
Beginning Balance	104,739	101,437	106,612	102,736	102,736
Provision for credit losses (benefit)	15,059	20,298	32,557	39,326
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(20,241)	(22,473)	(42,803)	(47,052)	(91,119)
Recoveries	2,865	4,392	6,056	8,644
Ending Balance	102,422	103,654	102,422	103,654	106,612
Consumer | Auto
Allowance for credit losses - loans:
Beginning Balance	170,544	171,979	180,364	165,995	165,995
Provision for credit losses (benefit)	(193)	16,852	2,813	36,323
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(12,772)	(13,418)	(33,922)	(34,474)	(76,284)
Recoveries	6,964	6,861	15,288	14,430
Ending Balance	164,543	182,274	164,543	182,274	180,364
Consumer | Other
Allowance for credit losses - loans:
Beginning Balance	7,713	7,009	8,174	7,004	7,004
Provision for credit losses (benefit)	971	1,311	1,035	2,055
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(1,576)	(713)	(2,336)	(1,622)	(4,072)
Recoveries	246	155	481	325
Ending Balance	7,354	7,762	7,354	7,762	8,174
BPPR
Allowance for credit losses - loans:
Beginning Balance	732,235	676,263	717,920	670,666	670,666
Provision for credit losses (benefit)	61,738	43,150	135,036	95,840
Allowance for credit losses - PCD Loans	2	0	9	9
Charge-offs	(129,624)	(60,715)	(209,908)	(131,939)
Recoveries	27,936	20,551	49,230	44,673
Ending Balance	692,287	679,249	692,287	679,249	717,920
Allowance for credit losses - unfunded commitments:
Beginning Balance	8,681	9,005	8,563	8,388	8,388
Provision for credit losses (benefit)	1,052	(1,260)	1,170	(643)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	9,733	7,745	9,733	7,745	8,563
BPPR | Construction
Allowance for credit losses - loans:
Beginning Balance	5,767	2,719	4,488	2,743	2,743
Provision for credit losses (benefit)	(964)	356	304	332
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	11	0
Ending Balance	4,803	3,075	4,803	3,075	4,488
Allowance for credit losses - unfunded commitments:
Beginning Balance	3,291	1,560	2,570	1,663	1,663
Provision for credit losses (benefit)	(213)	309	508	206
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	3,078	1,869	3,078	1,869	2,570
BPPR | Mortgage
Allowance for credit losses - loans:
Beginning Balance	73,761	74,289	70,674	72,901	72,901
Provision for credit losses (benefit)	(8,187)	(1,752)	(7,423)	(2,870)
Allowance for credit losses - PCD Loans	2	0	9	9
Charge-offs	(28)	(550)	(511)	(985)	(1,436)
Recoveries	4,950	2,979	7,749	5,911
Ending Balance	70,498	74,966	70,498	74,966	70,674
BPPR | Commercial
Allowance for credit losses - loans:
Beginning Balance	268,968	213,694	246,619	215,126	215,126
Provision for credit losses (benefit)	44,857	(7,835)	78,695	(11,798)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(75,492)	(2,501)	(89,332)	(5,967)
Recoveries	8,251	2,527	10,602	8,524
Ending Balance	246,584	205,885	246,584	205,885	246,619
Allowance for credit losses - unfunded commitments:
Beginning Balance	5,390	7,445	5,993	6,725	6,725
Provision for credit losses (benefit)	1,265	(1,569)	662	(849)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	6,655	5,876	6,655	5,876	5,993
BPPR | Commercial | Commercial multi-family
Allowance for credit losses - loans:
Beginning Balance	4,704	3,420	3,871	2,783	2,783
Provision for credit losses (benefit)	(635)	270	196	905
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	6	2	8
Ending Balance	4,069	3,696	4,069	3,696	3,871
BPPR | Commercial | Commercial real estate Non-owner occupied
Allowance for credit losses - loans:
Beginning Balance	48,881	42,848	44,149	44,852	44,852
Provision for credit losses (benefit)	(12,804)	(160)	3,043	(2,759)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(743)	(21)	(11,874)	(86)	(13,576)
Recoveries	4,845	472	4,861	1,132
Ending Balance	40,179	43,139	40,179	43,139	44,149
BPPR | Commercial | Commercial real estate Owner occupied
Allowance for credit losses - loans:
Beginning Balance	35,403	36,019	34,722	37,355	37,355
Provision for credit losses (benefit)	(1,917)	(1,176)	(1,591)	(2,918)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	0	(14)	(91)	(103)	(363)
Recoveries	2,063	1,019	2,509	1,514
Ending Balance	35,549	35,848	35,549	35,848	34,722
BPPR | Commercial | Commercial and industrial
Allowance for credit losses - loans:
Beginning Balance	179,980	131,407	163,877	130,136	130,136
Provision for credit losses (benefit)	60,213	(6,769)	77,047	(7,026)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(74,749)	(2,466)	(77,367)	(5,778)	(14,745)
Recoveries	1,343	1,030	3,230	5,870
Ending Balance	166,787	123,202	166,787	123,202	163,877
BPPR | Leasing
Allowance for credit losses - loans:
Beginning Balance	18,588	20,206	18,620	16,419	16,419
Provision for credit losses (benefit)	879	2,570	3,416	9,629
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(3,342)	(3,982)	(7,427)	(8,526)	(16,856)
Recoveries	1,502	1,246	3,018	2,518
Ending Balance	17,627	20,040	17,627	20,040	18,620
BPPR | Consumer
Allowance for credit losses - loans:
Beginning Balance	365,151	365,355	377,519	363,477	363,477
Provision for credit losses (benefit)	25,153	49,811	60,044	100,547
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(50,762)	(53,682)	(112,638)	(116,461)
Recoveries	13,233	13,799	27,850	27,720
Ending Balance	352,775	375,283	352,775	375,283	377,519
BPPR | Consumer | Credit cards
Allowance for credit losses - loans:
Beginning Balance	89,376	96,523	91,124	99,130	99,130
Provision for credit losses (benefit)	9,741	13,094	24,046	26,916
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(17,722)	(20,011)	(36,957)	(38,876)	(75,428)
Recoveries	3,422	2,700	6,604	5,136
Ending Balance	84,817	92,306	84,817	92,306	91,124
BPPR | Consumer | Home equity lines of credit
Allowance for credit losses - loans:
Beginning Balance	67	60	58	54	54
Provision for credit losses (benefit)	(59)	(313)	(141)	(421)
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(29)	0	(29)	(25)	(25)
Recoveries	73	307	164	446
Ending Balance	52	54	52	54	58
BPPR | Consumer | Personal
Allowance for credit losses - loans:
Beginning Balance	97,457	89,786	97,804	91,296	91,296
Provision for credit losses (benefit)	14,700	18,881	32,302	35,709
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(18,676)	(19,553)	(39,420)	(41,506)	(82,979)
Recoveries	2,533	3,777	5,328	7,392
Ending Balance	96,014	92,891	96,014	92,891	97,804
BPPR | Consumer | Auto
Allowance for credit losses - loans:
Beginning Balance	170,544	171,979	180,364	165,995	165,995
Provision for credit losses (benefit)	(193)	16,852	2,813	36,323
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(12,772)	(13,418)	(33,922)	(34,474)	(76,284)
Recoveries	6,964	6,861	15,288	14,430
Ending Balance	164,543	182,274	164,543	182,274	180,364
BPPR | Consumer | Other
Allowance for credit losses - loans:
Beginning Balance	7,707	7,007	8,169	7,002	7,002
Provision for credit losses (benefit)	964	1,297	1,024	2,020
Allowance for credit losses - PCD Loans	0	0	0	0
Charge-offs	(1,563)	(700)	(2,310)	(1,580)	(3,148)
Recoveries	241	154	466	316
Ending Balance	7,349	7,758	7,349	7,758	8,169
Popular U.S.
Allowance for credit losses - loans:
Beginning Balance	91,494	85,885	90,136	75,358	75,358
Provision for credit losses (benefit)	3,416	6,389	5,807	18,917
Charge-offs	(3,166)	(3,575)	(5,045)	(7,419)
Recoveries	801	1,537	1,647	3,380
Ending Balance	92,545	90,236	92,545	90,236	90,136
Allowance for credit losses - unfunded commitments:
Beginning Balance	5,866	5,164	5,875	7,082	7,082
Provision for credit losses (benefit)	(663)	144	(672)	(1,774)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	5,203	5,308	5,203	5,308	5,875
Popular U.S. | Construction
Allowance for credit losses - loans:
Beginning Balance	9,393	6,793	9,338	8,521	8,521
Provision for credit losses (benefit)	164	711	219	(1,017)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	9,557	7,504	9,557	7,504	9,338
Allowance for credit losses - unfunded commitments:
Beginning Balance	3,939	3,492	4,161	5,409	5,409
Provision for credit losses (benefit)	(907)	(203)	(1,129)	(2,120)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	3,032	3,289	3,032	3,289	4,161
Popular U.S. | Mortgage
Allowance for credit losses - loans:
Beginning Balance	9,863	9,740	9,880	9,508	9,508
Provision for credit losses (benefit)	(870)	437	(915)	484
Charge-offs	(4)	0	(23)	0
Recoveries	35	32	82	217
Ending Balance	9,024	10,209	9,024	10,209	9,880
Popular U.S. | Commercial
Allowance for credit losses - loans:
Beginning Balance	63,839	56,149	60,828	44,438	44,438
Provision for credit losses (benefit)	3,601	4,609	6,482	16,733
Charge-offs	(1,583)	(626)	(1,612)	(1,785)
Recoveries	323	294	482	1,040
Ending Balance	66,180	60,426	66,180	60,426	60,828
Allowance for credit losses - unfunded commitments:
Beginning Balance	1,802	1,630	1,570	1,662	1,662
Provision for credit losses (benefit)	234	305	466	273
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	2,036	1,935	2,036	1,935	1,570
Popular U.S. | Commercial | Commercial multi-family
Allowance for credit losses - loans:
Beginning Balance	15,365	10,081	15,474	6,453	6,453
Provision for credit losses (benefit)	797	3,567	688	7,194
Charge-offs	(1,312)	(563)	(1,312)	(563)	(563)
Recoveries	0	0	0	1
Ending Balance	14,850	13,085	14,850	13,085	15,474
Popular U.S. | Commercial | Commercial real estate Non-owner occupied
Allowance for credit losses - loans:
Beginning Balance	15,265	15,453	14,568	9,642	9,642
Provision for credit losses (benefit)	366	525	1,063	6,336
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	15,631	15,978	15,631	15,978	14,568
Popular U.S. | Commercial | Commercial real estate Owner occupied
Allowance for credit losses - loans:
Beginning Balance	15,713	14,193	13,729	12,473	12,473
Provision for credit losses (benefit)	1,238	(1,016)	3,107	193
Charge-offs	0	(14)	0	(26)	(27)
Recoveries	139	40	254	563
Ending Balance	17,090	13,203	17,090	13,203	13,729
Popular U.S. | Commercial | Commercial and industrial
Allowance for credit losses - loans:
Beginning Balance	17,496	16,422	17,057	15,870	15,870
Provision for credit losses (benefit)	1,200	1,533	1,624	3,010
Charge-offs	(271)	(49)	(300)	(1,196)	(2,445)
Recoveries	184	254	228	476
Ending Balance	18,609	18,160	18,609	18,160	17,057
Popular U.S. | Consumer
Allowance for credit losses - loans:
Beginning Balance	8,399	13,203	10,090	12,891	12,891
Provision for credit losses (benefit)	521	632	21	2,717
Charge-offs	(1,579)	(2,949)	(3,410)	(5,634)
Recoveries	443	1,211	1,083	2,123
Ending Balance	7,784	12,097	7,784	12,097	10,090
Allowance for credit losses - unfunded commitments:
Beginning Balance	125	42	144	11	11
Provision for credit losses (benefit)	10	42	(9)	73
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending Balance	135	84	135	84	144
Popular U.S. | Consumer | Credit cards
Allowance for credit losses - loans:
Beginning Balance	0		0
Provision for credit losses (benefit)	1		1
Charge-offs	(1)		(1)
Recoveries	0		0
Ending Balance	0		0		0
Popular U.S. | Consumer | Home equity lines of credit
Allowance for credit losses - loans:
Beginning Balance	1,111	1,550	1,277	1,449	1,449
Provision for credit losses (benefit)	154	(799)	(246)	(935)
Charge-offs	0	(16)	0	(46)	(84)
Recoveries	106	595	340	862
Ending Balance	1,371	1,330	1,371	1,330	1,277
Popular U.S. | Consumer | Personal
Allowance for credit losses - loans:
Beginning Balance	7,282	11,651	8,808	11,440	11,440
Provision for credit losses (benefit)	359	1,417	255	3,617
Charge-offs	(1,565)	(2,920)	(3,383)	(5,546)	(8,140)
Recoveries	332	615	728	1,252
Ending Balance	6,408	10,763	6,408	10,763	8,808
Popular U.S. | Consumer | Other
Allowance for credit losses - loans:
Beginning Balance	6	2	5	2	2
Provision for credit losses (benefit)	7	14	11	35
Charge-offs	(13)	(13)	(26)	(42)	(924)
Recoveries	5	1	15	9
Ending Balance	$ 5	$ 4	$ 5	$ 4	$ 5