Segment reporting - Selected Balance Sheet information (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Segment Reporting Information [Line Items]
Assets	$ 70,838,266	$ 67,637,917	$ 71,501,931
Deposits	64,004,818	61,227,227
Puerto Rico
Segment Reporting Information [Line Items]
Assets	55,719,290	53,541,427
Loans	21,323,370	20,884,442
Deposits	53,166,029	51,138,790
Popular U.S.
Segment Reporting Information [Line Items]
Assets	13,907,471	12,718,775
Loans	11,215,440	10,643,964
Deposits	9,069,798	8,182,702
Other
Segment Reporting Information [Line Items]
Assets	1,211,505	1,377,715
Loans	547,533	554,744
Deposits	$ 1,768,991	$ 1,905,735