Loans - Amortized cost basis and interest income recognized on non-accrual loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	$ 125,958	$ 177,104
Non-accrual with allowance	231,653	262,337
Construction
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0
Non-accrual with allowance	6,378
Mortgages
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	84,797	119,098
Non-accrual with allowance	101,500	143,781
Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	1,991	242
Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	3,695	17,093
Non-accrual with allowance	6,167	8,023
Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	24,309	14,165
Non-accrual with allowance	11,395	14,920
Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	6,991	20,227
Non-accrual with allowance	29,607	18,369
Leasing
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	481	458
Non-accrual with allowance	8,151	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	3,733	4,110
Consumer | Personal loans
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	3,589	4,623
Non-accrual with allowance	18,247	15,417
Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	1,833	1,177
Non-accrual with allowance	43,782	39,801
Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	263	263
Non-accrual with allowance	702	12,191
Puerto Rico
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	121,961	170,484
Non-accrual with allowance	206,757	231,525
Puerto Rico | Construction
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0
Non-accrual with allowance	6,378
Puerto Rico | Mortgages
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	84,677	119,027
Non-accrual with allowance	90,429	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	1,991	242
Puerto Rico | Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	3,695	15,639
Non-accrual with allowance	5,050	8,023
Puerto Rico | Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	20,432	9,070
Non-accrual with allowance	8,998	14,920
Puerto Rico | Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	6,991	20,227
Non-accrual with allowance	25,835	14,050
Puerto Rico | Leasing
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	481	458
Non-accrual with allowance	8,151	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	3,589	4,623
Non-accrual with allowance	15,442	13,459
Puerto Rico | Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	1,833	1,177
Non-accrual with allowance	43,782	39,801
Puerto Rico | Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	263	263
Non-accrual with allowance	701	12,183
Popular U.S.
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	3,997	6,620
Non-accrual with allowance	24,896	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	120	71
Non-accrual with allowance	11,071	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	0	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	1,117	0
Popular U.S. | Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	3,877	5,095
Non-accrual with allowance	2,397	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	3,772	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	3,733	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	2,805	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	$ 1	$ 8