Loans - Amortized cost basis and interest income recognized on non-accrual loans (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	$ 123,706	$ 125,958
Non-accrual with allowance	227,074	231,653
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	67,245	84,797
Non-accrual with allowance	121,087	101,500
Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	8,700	0
Non-accrual with allowance	79	1,991
Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	10,565	3,695
Non-accrual with allowance	3,879	6,167
Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	22,724	24,309
Non-accrual with allowance	7,725	11,395
Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	9,020	6,991
Non-accrual with allowance	12,063	29,607
Leasing
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	500	481
Non-accrual with allowance	9,088	8,151
Consumer | Home equity lines of credit
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	3,393	3,733
Consumer | Personal loans
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	2,960	3,589
Non-accrual with allowance	19,050	18,247
Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	1,992	1,833
Non-accrual with allowance	49,800	43,782
Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	263
Non-accrual with allowance	910	702
Puerto Rico
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	101,865	121,961
Non-accrual with allowance	190,226	206,757
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	66,176	84,677
Non-accrual with allowance	92,266	90,429
Puerto Rico | Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	79	1,991
Puerto Rico | Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	3,450	3,695
Non-accrual with allowance	2,979	5,050
Puerto Rico | Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	17,767	20,432
Non-accrual with allowance	7,491	8,998
Puerto Rico | Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	9,020	6,991
Non-accrual with allowance	10,315	25,835
Puerto Rico | Leasing
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	500	481
Non-accrual with allowance	9,088	8,151
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	2,960	3,589
Non-accrual with allowance	17,309	15,442
Puerto Rico | Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	1,992	1,833
Non-accrual with allowance	49,800	43,782
Puerto Rico | Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	263
Non-accrual with allowance	899	701
Popular U.S.
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	21,841	3,997
Non-accrual with allowance	36,848	24,896
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	1,069	120
Non-accrual with allowance	28,821	11,071
Popular U.S. | Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	8,700	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	7,115	0
Non-accrual with allowance	900	1,117
Popular U.S. | Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	4,957	3,877
Non-accrual with allowance	234	2,397
Popular U.S. | Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	1,748	3,772
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	3,393	3,733
Popular U.S. | Consumer | Personal loans
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	1,741	2,805
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	$ 11	$ 1