Segment reporting - Results of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information
Interest income	$ 3,673,263	$ 3,245,307	$ 2,465,911
Interest expense	1,390,975	1,113,783	298,552
Net Interest income (expense)	2,282,288	2,131,524	2,167,359
Provision for credit losses	256,942	208,609	83,030
Non-interest Income	658,909	650,724	897,062
Personnel costs	820,451	778,045	719,764
Professional fees	125,822	161,142	172,043
Technology and software expenses	329,061	290,615	291,902
Processing and transactional services	142,677	138,070	127,145
Amortization of intangibles	2,938	3,180	3,275
Goodwill impairment losses	0	23,000	9,000
Depreciation expense	57,078	58,507	55,107
Other operating expenses	409,610	445,541	368,184
Total operating expenses	1,887,637	1,898,100	1,746,420
Income before income tax	796,618	675,539	1,234,971
Income tax expense (benefit)	182,406	134,197	132,330
Net income (loss)	614,212	541,342	1,102,641
Segment assets	73,045,383	70,758,155	67,637,917
Banco Popular de Puerto Rico
Segment Reporting Information
Goodwill impairment losses	0	0
PB
Segment Reporting Information
Goodwill impairment losses	0	23,000
Reportable Segment
Segment Reporting Information
Interest income	3,670,308	3,242,575	2,463,348
Interest expense	1,357,740	1,080,273	266,840
Net Interest income (expense)	2,312,568	2,162,302	2,196,508
Provision for credit losses	256,212	208,909	82,756
Non-interest Income	622,453	611,141	711,687
Personnel costs	706,600	674,510	631,592
Professional fees	71,193	96,117	80,770
Technology and software expenses	292,468	264,542	265,773
Processing and transactional services	142,655	138,049	127,112
Amortization of intangibles	2,938	3,180	3,275
Goodwill impairment losses		23,000	9,000
Depreciation expense	55,518	57,023	53,922
Other operating expenses	612,315	644,202	578,533
Total operating expenses	1,883,687	1,900,623	1,749,977
Income before income tax	795,122	663,911	1,075,462
Income tax expense (benefit)	161,756	135,610	123,146
Net income (loss)	633,366	528,301	952,316
Segment assets	72,670,209	70,409,171	67,326,759
Reportable Segment | Banco Popular de Puerto Rico
Segment Reporting Information
Interest income	2,926,996	2,631,407	2,026,539
Interest expense	970,430	819,752	203,022
Net Interest income (expense)	1,956,566	1,811,655	1,823,517
Provision for credit losses	254,843	194,325	70,304
Non-interest Income	596,262	586,677	680,276
Personnel costs	601,652	571,516	534,539
Professional fees	58,687	79,108	61,299
Technology and software expenses	254,584	232,652	237,187
Processing and transactional services	140,293	135,528	124,751
Amortization of intangibles	1,696	1,937	1,937
Goodwill impairment losses		0	0
Depreciation expense	47,019	49,135	47,003
Other operating expenses	510,108	544,767	496,411
Total operating expenses	1,614,039	1,614,643	1,503,127
Income before income tax	683,946	589,364	930,362
Income tax expense (benefit)	128,207	117,412	148,351
Net income (loss)	555,739	471,952	782,011
Segment assets	58,601,802	57,023,071	56,190,260
Reportable Segment | PB
Segment Reporting Information
Interest income	753,912	627,600	442,053
Interest expense	397,910	276,955	69,065
Net Interest income (expense)	356,002	350,645	372,988
Provision for credit losses	1,369	14,584	12,452
Non-interest Income	26,247	24,868	31,958
Personnel costs	104,948	102,994	97,053
Professional fees	12,562	17,410	20,006
Technology and software expenses	37,884	31,890	28,586
Processing and transactional services	2,362	2,521	2,361
Amortization of intangibles	1,242	1,243	1,338
Goodwill impairment losses		23,000	9,000
Depreciation expense	8,499	7,888	6,919
Other operating expenses	102,207	99,438	82,130
Total operating expenses	269,704	286,384	247,393
Income before income tax	111,176	74,545	145,101
Income tax expense (benefit)	33,549	18,198	(25,205)
Net income (loss)	77,627	56,347	170,306
Segment assets	14,333,292	13,812,158	11,558,280
Intersegment Elimination
Segment Reporting Information
Interest income	(10,600)	(16,432)	(5,244)
Interest expense	(10,600)	(16,434)	(5,247)
Net Interest income (expense)	0	2	3
Provision for credit losses	0	0	0
Non-interest Income	(56)	(404)	(547)
Personnel costs	0	0	0
Professional fees	(56)	(401)	(535)
Technology and software expenses	0	0	0
Processing and transactional services	0	0	0
Amortization of intangibles	0	0	0
Goodwill impairment losses		0	0
Depreciation expense	0	0	0
Other operating expenses	0	(3)	(8)
Total operating expenses	(56)	(404)	(543)
Income before income tax	0	2	(1)
Income tax expense (benefit)	0	0	0
Net income (loss)	0	2	(1)
Segment assets	(264,885)	(426,058)	(421,781)
Corporate
Segment Reporting Information
Interest income	12,589	18,141	3,102
Interest expense	42,869	48,919	32,251
Net Interest income (expense)	(30,280)	(30,778)	(29,149)
Provision for credit losses	730	(300)	274
Non-interest Income	41,046	44,410	189,835
Personnel costs	113,851	103,535	88,172
Professional fees	55,608	65,713	92,088
Technology and software expenses	36,593	26,073	26,129
Processing and transactional services	22	21	33
Amortization of intangibles	0	0	0
Goodwill impairment losses		0	0
Depreciation expense	1,560	1,484	1,185
Other operating expenses	(199,165)	(194,824)	(206,342)
Total operating expenses	8,469	2,002	1,265
Income before income tax	1,567	11,930	159,147
Income tax expense (benefit)	20,609	(1,333)	9,074
Net income (loss)	(19,042)	13,263	150,073
Segment assets	5,895,389	5,607,833	5,390,122
Eliminations
Segment Reporting Information
Interest income	(9,634)	(15,409)	(539)
Interest expense	(9,634)	(15,409)	(539)
Net Interest income (expense)	0	0	0
Provision for credit losses	0	0	0
Non-interest Income	(4,590)	(4,827)	(4,460)
Personnel costs	0	0	0
Professional fees	(979)	(688)	(815)
Technology and software expenses	0	0	0
Processing and transactional services	0	0	0
Amortization of intangibles	0	0	0
Goodwill impairment losses		0	0
Depreciation expense	0	0	0
Other operating expenses	(3,540)	(3,837)	(4,007)
Total operating expenses	(4,519)	(4,525)	(4,822)
Income before income tax	(71)	(302)	362
Income tax expense (benefit)	41	(80)	110
Net income (loss)	(112)	(222)	252
Segment assets	$ (5,520,215)	$ (5,258,849)	$ (5,078,964)