Allowance for credit losses - Performance of loans modified (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	$ 555,791	$ 165,314
Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	61,306	25,642
Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	10,037	3,224
Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	3,993	1,661
Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	47,276	20,757
With payment default	17,141	1,324
Without payment default	30,135	19,433
Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	494,485	139,672
Construction
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		10,122
Construction \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
Construction \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
Construction \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
Construction \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
With payment default		0
Without payment default		0
Construction \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		10,122
Mortgages
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	84,128	52,191
Mortgages \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	36,872	21,322
Mortgages \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	8,969	3,158
Mortgages \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	3,596	1,611
Mortgages \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	24,307	16,553
With payment default	4,833	1,151
Without payment default	19,474	15,402
Mortgages \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	47,256	30,869
Commercial \| Commercial multi-family
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	64
Commercial \| Commercial multi-family \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	64
Commercial \| Commercial multi-family \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0
Commercial \| Commercial multi-family \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0
Commercial \| Commercial multi-family \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	64
With payment default	0
Without payment default	64
Commercial \| Commercial multi-family \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0
Commercial \| CRE non-owner occupied
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	126,303	26,721
Commercial \| CRE non-owner occupied \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	3,023	428
Commercial \| CRE non-owner occupied \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	176	0
Commercial \| CRE non-owner occupied \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Commercial \| CRE non-owner occupied \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	2,847	428
With payment default	0	0
Without payment default	2,847	428
Commercial \| CRE non-owner occupied \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	123,280	26,293
Commercial \| CRE owner occupied
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	238,628	46,455
Commercial \| CRE owner occupied \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	2,311	2,338
Commercial \| CRE owner occupied \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	335	0
Commercial \| CRE owner occupied \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Commercial \| CRE owner occupied \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	1,976	2,338
With payment default	0	0
Without payment default	1,976	2,338
Commercial \| CRE owner occupied \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	236,317	44,117
Commercial \| Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	97,782	27,422
Commercial \| Commercial and Industrial \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	16,731	872
Commercial \| Commercial and Industrial \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	379	0
Commercial \| Commercial and Industrial \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	27	0
Commercial \| Commercial and Industrial \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	16,325	872
With payment default	11,994	114
Without payment default	4,331	758
Commercial \| Commercial and Industrial \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	81,051	26,550
Consumer \| Credit card
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	1,637	872
Consumer \| Credit card \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	368	177
Consumer \| Credit card \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	81	36
Consumer \| Credit card \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	174	50
Consumer \| Credit card \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	113	91
With payment default	79	51
Without payment default	34	40
Consumer \| Credit card \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	1,269	695
Consumer \| Personal loans
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	7,113	1,462
Consumer \| Personal loans \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	1,864	493
Consumer \| Personal loans \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	97	30
Consumer \| Personal loans \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	196	0
Consumer \| Personal loans \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	1,571	463
With payment default	235	8
Without payment default	1,336	455
Consumer \| Personal loans \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	5,249	969
Consumer \| Auto Loan
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	107	66
Consumer \| Auto Loan \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	48	12
Consumer \| Auto Loan \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Consumer \| Auto Loan \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Consumer \| Auto Loan \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	48	12
With payment default	0	0
Without payment default	48	12
Consumer \| Auto Loan \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	59	54
Consumer \| Other
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	29	3
Consumer \| Other \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	25	0
Consumer \| Other \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Consumer \| Other \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Consumer \| Other \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	25	0
With payment default	0	0
Without payment default	25	0
Consumer \| Other \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	4	3
Puerto Rico
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	504,835	125,336
Puerto Rico \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	60,381	25,170
Puerto Rico \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	10,018	3,224
Puerto Rico \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	3,969	1,661
Puerto Rico \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	46,394	20,285
With payment default	17,138	1,220
Without payment default	29,256	19,065
Puerto Rico \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	444,454	100,166
Puerto Rico \| Construction
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		5,422
Puerto Rico \| Construction \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
Puerto Rico \| Construction \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
Puerto Rico \| Construction \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
Puerto Rico \| Construction \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
With payment default		0
Without payment default		0
Puerto Rico \| Construction \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		5,422
Puerto Rico \| Mortgages
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	82,437	47,268
Puerto Rico \| Mortgages \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	36,100	20,982
Puerto Rico \| Mortgages \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	8,969	3,158
Puerto Rico \| Mortgages \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	3,596	1,611
Puerto Rico \| Mortgages \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	23,535	16,213
With payment default	4,833	1,047
Without payment default	18,702	15,166
Puerto Rico \| Mortgages \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	46,337	26,286
Puerto Rico \| Commercial \| Commercial multi-family
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	64
Puerto Rico \| Commercial \| Commercial multi-family \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	64
Puerto Rico \| Commercial \| Commercial multi-family \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0
Puerto Rico \| Commercial \| Commercial multi-family \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0
Puerto Rico \| Commercial \| Commercial multi-family \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	64
With payment default	0
Without payment default	64
Puerto Rico \| Commercial \| Commercial multi-family \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0
Puerto Rico \| Commercial \| CRE non-owner occupied
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	126,303	26,721
Puerto Rico \| Commercial \| CRE non-owner occupied \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	3,023	428
Puerto Rico \| Commercial \| CRE non-owner occupied \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	176	0
Puerto Rico \| Commercial \| CRE non-owner occupied \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Puerto Rico \| Commercial \| CRE non-owner occupied \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	2,847	428
With payment default	0	0
Without payment default	2,847	428
Puerto Rico \| Commercial \| CRE non-owner occupied \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	123,280	26,293
Puerto Rico \| Commercial \| CRE owner occupied
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	189,680	17,090
Puerto Rico \| Commercial \| CRE owner occupied \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	2,311	2,338
Puerto Rico \| Commercial \| CRE owner occupied \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	335	0
Puerto Rico \| Commercial \| CRE owner occupied \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Puerto Rico \| Commercial \| CRE owner occupied \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	1,976	2,338
With payment default	0	0
Without payment default	1,976	2,338
Puerto Rico \| Commercial \| CRE owner occupied \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	187,369	14,752
Puerto Rico \| Commercial \| Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	97,782	26,600
Puerto Rico \| Commercial \| Commercial and Industrial \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	16,731	872
Puerto Rico \| Commercial \| Commercial and Industrial \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	379	0
Puerto Rico \| Commercial \| Commercial and Industrial \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	27	0
Puerto Rico \| Commercial \| Commercial and Industrial \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	16,325	872
With payment default	11,994	114
Without payment default	4,331	758
Puerto Rico \| Commercial \| Commercial and Industrial \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	81,051	25,728
Puerto Rico \| Consumer \| Credit card
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	1,637	872
Puerto Rico \| Consumer \| Credit card \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	368	177
Puerto Rico \| Consumer \| Credit card \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	81	36
Puerto Rico \| Consumer \| Credit card \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	174	50
Puerto Rico \| Consumer \| Credit card \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	113	91
With payment default	79	51
Without payment default	34	40
Puerto Rico \| Consumer \| Credit card \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	1,269	695
Puerto Rico \| Consumer \| Personal loans
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	6,796	1,294
Puerto Rico \| Consumer \| Personal loans \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	1,711	361
Puerto Rico \| Consumer \| Personal loans \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	78	30
Puerto Rico \| Consumer \| Personal loans \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	172	0
Puerto Rico \| Consumer \| Personal loans \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	1,461	331
With payment default	232	8
Without payment default	1,229	323
Puerto Rico \| Consumer \| Personal loans \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	5,085	933
Puerto Rico \| Consumer \| Auto Loan
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	107	66
Puerto Rico \| Consumer \| Auto Loan \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	48	12
Puerto Rico \| Consumer \| Auto Loan \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Puerto Rico \| Consumer \| Auto Loan \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Puerto Rico \| Consumer \| Auto Loan \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	48	12
With payment default	0	0
Without payment default	48	12
Puerto Rico \| Consumer \| Auto Loan \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	59	54
Puerto Rico \| Consumer \| Other
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	29	3
Puerto Rico \| Consumer \| Other \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	25	0
Puerto Rico \| Consumer \| Other \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Puerto Rico \| Consumer \| Other \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Puerto Rico \| Consumer \| Other \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	25	0
With payment default	0	0
Without payment default	25	0
Puerto Rico \| Consumer \| Other \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	4	3
Popular U.S.
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	50,956	39,978
Popular U.S. \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	925	472
Popular U.S. \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	19	0
Popular U.S. \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	24	0
Popular U.S. \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	882	472
With payment default	3	104
Without payment default	879	368
Popular U.S. \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	50,031	39,506
Popular U.S. \| Construction
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		4,700
Popular U.S. \| Construction \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
Popular U.S. \| Construction \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
Popular U.S. \| Construction \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
Popular U.S. \| Construction \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		0
With payment default		0
Without payment default		0
Popular U.S. \| Construction \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification		4,700
Popular U.S. \| Mortgages
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	1,691	4,923
Popular U.S. \| Mortgages \| Past due
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	772	340
Popular U.S. \| Mortgages \| Past Due 30 To 59 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Popular U.S. \| Mortgages \| Past Due 60 To 89 Days
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	0	0
Popular U.S. \| Mortgages \| Past due 90 days or more
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	772	340
With payment default	0	104
Without payment default	772	236
Popular U.S. \| Mortgages \| Current
Financing Receivable, Modifications [Line Items]
Loan performance in the last 12 months after modification	919	4,583
Popular U.S. \| Commercial \| CRE owner occupied

Allowance for credit losses - Performance of loans modified (Details) - USD ($)
$ in Thousands

Jun. 30, 2024

Jun. 30, 2023

Financing Receivable, Modifications [Line Items]

Loan performance in the last 12 months after modification

$ 555,791

$ 165,314

Past due

Financing Receivable, Modifications [Line Items]

Loan performance in the last 12 months after modification

61,306

25,642