Goodwill and other intangible assets - Gross amount of goodwill and accumulated impairment losses by reportable segments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill gross	$ 1,004,640	$ 1,004,640
Accumulated impairment losses	200,212	177,212
Goodwill (net amounts)	804,428	827,428	$ 827,428	$ 720,293
Banco Popular de Puerto Rico
Goodwill [Line Items]
Goodwill gross	440,184	440,184
Accumulated impairment losses	3,801	3,801
Goodwill (net amounts)	436,383	436,383	436,383	320,248
Popular U.S.
Goodwill [Line Items]
Goodwill gross	564,456	564,456
Accumulated impairment losses	196,411	173,411
Goodwill (net amounts)	$ 368,045	$ 391,045	$ 391,045	$ 400,045