Loans - Amortized cost basis and interest income recognized on non-accrual loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	$ 175,612	$ 177,104
Non-accrual with allowance	209,892	262,337
Construction
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0
Non-accrual with allowance	9,284
Mortgages
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	104,324	119,098
Non-accrual with allowance	104,472	143,781
Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	602	242
Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	18,924	17,093
Non-accrual with allowance	4,137	8,023
Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	29,515	14,165
Non-accrual with allowance	11,412	14,920
Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	16,304	20,227
Non-accrual with allowance	19,432	18,369
Leasing
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	221	458
Non-accrual with allowance	4,522	5,483
Consumer | Home equity lines of credit
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	4,252	4,110
Consumer | Personal loans
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	4,768	4,623
Non-accrual with allowance	15,396	15,417
Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	1,293	1,177
Non-accrual with allowance	34,911	39,801
Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	263	263
Non-accrual with allowance	1,472	12,191
Puerto Rico
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	170,014	170,484
Non-accrual with allowance	182,325	231,525
Puerto Rico | Construction
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0
Non-accrual with allowance	9,284
Puerto Rico | Mortgages
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	103,821	119,027
Non-accrual with allowance	90,398	123,364
Puerto Rico | Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	184	242
Puerto Rico | Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	18,924	15,639
Non-accrual with allowance	4,018	8,023
Puerto Rico | Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	24,420	9,070
Non-accrual with allowance	11,412	14,920
Puerto Rico | Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	16,304	20,227
Non-accrual with allowance	13,454	14,050
Puerto Rico | Leasing
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	221	458
Non-accrual with allowance	4,522	5,483
Puerto Rico | Consumer | Home equity lines of credit
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	0	0
Puerto Rico | Consumer | Personal loans
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	4,768	4,623
Non-accrual with allowance	12,670	13,459
Puerto Rico | Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	1,293	1,177
Non-accrual with allowance	34,911	39,801
Puerto Rico | Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	263	263
Non-accrual with allowance	1,472	12,183
Popular U.S.
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	5,598	6,620
Non-accrual with allowance	27,567	30,812
Popular U.S. | Construction
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0
Non-accrual with allowance	0
Popular U.S. | Mortgages
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	503	71
Non-accrual with allowance	14,074	20,417
Popular U.S. | Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	418	0
Popular U.S. | Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	1,454
Non-accrual with allowance	119	0
Popular U.S. | Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	5,095	5,095
Non-accrual with allowance	0	0
Popular U.S. | Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	5,978	4,319
Popular U.S. | Leasing
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	0	0
Popular U.S. | Consumer | Home equity lines of credit
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	4,252	4,110
Popular U.S. | Consumer | Personal loans
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	2,726	1,958
Popular U.S. | Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	0	0
Popular U.S. | Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	$ 0	$ 8