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Allowance for credit losses - Performance of loans modified (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification $ 398,599 $ 339,528
Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 42,796 60,388
Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 7,400 18,644
Past Due 60 To 89 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 4,141 4,517
Past due 90 days or more    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 31,255 37,227
With payment default 9,249 7,201
Without payment default 22,006 30,026
Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 355,803 279,140
Construction    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   768
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   768
Mortgages    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 60,421 75,774
Mortgages | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 28,678 35,009
Mortgages | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 5,717 5,649
Mortgages | Past Due 60 To 89 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 2,960 4,359
Mortgages | Past due 90 days or more    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 20,001 25,001
With payment default 6,851 6,609
Without payment default 13,150 18,392
Mortgages | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 31,743 40,765
Commercial | Commercial multi-family    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   10,633
Commercial | Commercial multi-family | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   63
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   63
With payment default   0
Without payment default   63
Commercial | Commercial multi-family | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   10,570
Commercial | CRE non-owner occupied    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 60,736 58,564
Commercial | CRE non-owner occupied | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 2,084 2,798
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 0 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 2,084 2,798
With payment default 311 0
Without payment default 1,773 2,798
Commercial | CRE non-owner occupied | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 58,652 55,766
Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 58,769 78,534
Commercial | CRE owner occupied | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 2,707 2,324
Commercial | CRE owner occupied | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 135 92
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 2,572 2,232
With payment default 63 89
Without payment default 2,509 2,143
Commercial | CRE owner occupied | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 56,062 76,210
Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 192,303 103,405
Commercial | Commercial and Industrial | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 3,401 17,202
Commercial | Commercial and Industrial | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 175 12,359
Commercial | Commercial and Industrial | Past Due 60 To 89 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 171 26
Commercial | Commercial and Industrial | Past due 90 days or more    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 3,055 4,817
With payment default 520 96
Without payment default 2,535 4,721
Commercial | Commercial and Industrial | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 188,902 86,203
Consumer | Credit card    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 9,560 2,284
Consumer | Credit card | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 2,749 569
Consumer | Credit card | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 760 205
Consumer | Credit card | Past Due 60 To 89 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 670 81
Consumer | Credit card | Past due 90 days or more    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 1,319 283
With payment default 1,135 197
Without payment default 184 86
Consumer | Credit card | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 6,811 1,715
Consumer | Personal loans    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 16,551 9,435
Consumer | Personal loans | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 3,177 2,365
Consumer | Personal loans | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 613 315
Consumer | Personal loans | Past Due 60 To 89 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 340 51
Consumer | Personal loans | Past due 90 days or more    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 2,224 1,999
With payment default 369 210
Without payment default 1,855 1,789
Consumer | Personal loans | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 13,374 7,070
Consumer | Auto Loan    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 254 103
Consumer | Auto Loan | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 0 34
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 0 34
With payment default 0 0
Without payment default 0 34
Consumer | Auto Loan | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 254 69
Consumer | Other    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 5 28
Consumer | Other | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 0 24
Consumer | Other | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 0 24
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 0 0
With payment default 0 0
Without payment default 0 0
Consumer | Other | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 5 4
Puerto Rico    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 336,801 287,571
Puerto Rico | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 42,755 59,479
Puerto Rico | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 7,372 18,615
Puerto Rico | Past Due 60 To 89 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 4,141 4,517
Puerto Rico | Past due 90 days or more    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 31,242 36,347
With payment default 9,236 7,201
Without payment default 22,006 29,146
Puerto Rico | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 294,046 228,092
Puerto Rico | Construction    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   768
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   768
Puerto Rico | Mortgages    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 58,902 74,572
Puerto Rico | Mortgages | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 28,678 34,214
Puerto Rico | Mortgages | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 5,717 5,649
Puerto Rico | Mortgages | Past Due 60 To 89 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 2,960 4,359
Puerto Rico | Mortgages | Past due 90 days or more    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 20,001 24,206
With payment default 6,851 6,609
Without payment default 13,150 17,597
Puerto Rico | Mortgages | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 30,224 40,358
Puerto Rico | Commercial | Commercial multi-family    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   63
Puerto Rico | Commercial | Commercial multi-family | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   63
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   63
With payment default   0
Without payment default   63
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 2,084 58,564
Puerto Rico | Commercial | CRE non-owner occupied | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 2,084 2,798
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 0 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 2,084 2,798
With payment default 311 0
Without payment default 1,773 2,798
Puerto Rico | Commercial | CRE non-owner occupied | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 0 55,766
Puerto Rico | Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 58,769 38,679
Puerto Rico | Commercial | CRE owner occupied | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 2,707 2,324
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 135 92
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 2,572 2,232
With payment default 63 89
Without payment default 2,509 2,143
Puerto Rico | Commercial | CRE owner occupied | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 56,062 36,355
Puerto Rico | Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 190,881 103,405
Puerto Rico | Commercial | Commercial and Industrial | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 3,401 17,202
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 175 12,359
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 171 26
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 3,055 4,817
With payment default 520 96
Without payment default 2,535 4,721
Puerto Rico | Commercial | Commercial and Industrial | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 187,480 86,203
Puerto Rico | Consumer | Credit card    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 9,560 2,284
Puerto Rico | Consumer | Credit card | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 2,749 569
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 760 205
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 670 81
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 1,319 283
With payment default 1,135 197
Without payment default 184 86
Puerto Rico | Consumer | Credit card | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 6,811 1,715
Puerto Rico | Consumer | Personal loans    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 16,346 9,105
Puerto Rico | Consumer | Personal loans | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 3,136 2,251
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 585 286
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 340 51
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 2,211 1,914
With payment default 356 210
Without payment default 1,855 1,704
Puerto Rico | Consumer | Personal loans | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 13,210 6,854
Puerto Rico | Consumer | Auto Loan    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 254 103
Puerto Rico | Consumer | Auto Loan | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 0 34
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 0 34
With payment default 0 0
Without payment default 0 34
Puerto Rico | Consumer | Auto Loan | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 254 69
Puerto Rico | Consumer | Other    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 5 28
Puerto Rico | Consumer | Other | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 0 24
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 24
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 0 0
With payment default 0 0
Without payment default 0 0
Puerto Rico | Consumer | Other | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 5 4
Popular U.S.    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 61,798 51,957
Popular U.S. | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 41 909
Popular U.S. | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 28 29
Popular U.S. | 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. | Past due 90 days or more    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 13 880
With payment default 13 0
Without payment default 0 880
Popular U.S. | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 61,757 51,048
Popular U.S. | Mortgages    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 1,519 1,202
Popular U.S. | Mortgages | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 0 795
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 0 795
With payment default 0 0
Without payment default 0 795
Popular U.S. | Mortgages | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 1,519 407
Popular U.S. | Commercial | Commercial multi-family    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   10,570
Popular U.S. | Commercial | Commercial multi-family | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   0
Popular U.S. | 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
Popular U.S. | 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
Popular U.S. | Commercial | Commercial multi-family | 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. | Commercial | Commercial multi-family | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   10,570
Popular U.S. | Commercial | CRE non-owner occupied    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 58,652  
Popular U.S. | Commercial | CRE non-owner occupied | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 0  
Popular U.S. | 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 0  
Popular U.S. | 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  
Popular U.S. | 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 0  
With payment default 0  
Without payment default 0  
Popular U.S. | Commercial | CRE non-owner occupied | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 58,652  
Popular U.S. | Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   39,855
Popular U.S. | Commercial | CRE owner occupied | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   0
Popular U.S. | Commercial | CRE owner occupied | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   0
Popular U.S. | 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
Popular U.S. | Commercial | CRE owner occupied | 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. | Commercial | CRE owner occupied | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification   39,855
Popular U.S. | Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 1,422  
Popular U.S. | Commercial | Commercial and Industrial | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 0  
Popular U.S. | Commercial | Commercial and Industrial | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 0  
Popular U.S. | Commercial | Commercial and Industrial | Past Due 60 To 89 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 0  
Popular U.S. | Commercial | Commercial and Industrial | 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. | Commercial | Commercial and Industrial | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 1,422  
Popular U.S. | Consumer | Personal loans    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 205 330
Popular U.S. | Consumer | Personal loans | Past due    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 41 114
Popular U.S. | Consumer | Personal loans | Past Due 30 To 59 Days    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 28 29
Popular U.S. | Consumer | Personal loans | 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. | Consumer | Personal loans | Past due 90 days or more    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification 13 85
With payment default 13 0
Without payment default 0 85
Popular U.S. | Consumer | Personal loans | Current    
Financing Receivable, Modifications [Line Items]    
Loan performance in the last 12 months after modification $ 164 $ 216