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Segment reporting - Selected Balance Sheet information (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Segment Reporting Information [Line Items]      
Assets $ 75,065,798 $ 73,045,383 $ 71,323,074
Deposits 66,513,404 64,884,345  
Puerto Rico      
Segment Reporting Information [Line Items]      
Assets 57,492,551 55,888,211  
Loans 25,362,400 24,154,610  
Deposits 52,929,118 52,099,309  
Popular U.S.      
Segment Reporting Information [Line Items]      
Assets 16,279,331 15,890,339  
Loans 12,815,827 12,431,859  
Deposits 11,861,212 11,030,879  
Other      
Segment Reporting Information [Line Items]      
Assets 1,293,916 1,266,833  
Loans 516,714 526,606  
Deposits $ 1,723,074 $ 1,754,157