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Goodwill and other intangible assets - Gross amount of goodwill and accumulated impairment losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill [RollForward]      
Beginning Balance $ 827,428 $ 720,293  
Goodwill on acquisition 0 116,135  
Goodwill impairment (23,000) (9,000) $ 0
Ending Balance 804,428 827,428 720,293
Banco Popular de Puerto Rico      
Goodwill [RollForward]      
Beginning Balance 436,383 320,248  
Goodwill on acquisition 0 116,135  
Goodwill impairment 0 0  
Ending Balance 436,383 436,383 320,248
Popular U.S.      
Goodwill [RollForward]      
Beginning Balance 391,045 400,045  
Goodwill on acquisition 0 0  
Goodwill impairment (23,000) (9,000)  
Ending Balance $ 368,045 $ 391,045 $ 400,045