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Fair value measurement - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Assets        
Debt securities available-for-sale $ 20,490,212 $ 18,245,903    
Mortgage servicing rights 103,077 108,103 $ 113,386 $ 118,109
US Treasury Securities        
Assets        
Debt securities available-for-sale 15,412,796 12,995,110    
Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 110,432 120,284    
Other        
Assets        
Debt securities available-for-sale 750 2,250    
Recurring        
Assets        
Debt securities available-for-sale 20,490,212 18,245,903    
Trading account debt securities, excluding derivatives 29,643 32,783    
Equity securities at fair value 47,456 46,045    
Mortgage servicing rights 103,077 108,103    
Loans held-for-sale 2,898 5,423    
Derivatives 24,792 26,023    
Total assets measured at fair value on a recurring basis 20,698,078 18,464,280    
Liabilities        
Derivatives (23,349) (22,832)    
Total (23,349) (22,832)    
Recurring | US Treasury Securities        
Assets        
Debt securities available-for-sale 15,412,796 12,995,110    
Trading account debt securities, excluding derivatives 5,823 2,824    
Recurring | Obligations of Puerto Rico, States and political subdivisions        
Assets        
Trading account debt securities, excluding derivatives 50 55    
Recurring | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 110,432 120,284    
Recurring | CMO        
Assets        
Trading account debt securities, excluding derivatives 615 655    
Recurring | Mortgage Backed Securities        
Assets        
Debt securities available-for-sale 4,966,234 5,128,259    
Trading account debt securities, excluding derivatives 23,033 29,116    
Recurring | Other        
Assets        
Debt securities available-for-sale 750 2,250    
Trading account debt securities, excluding derivatives 122 133    
Recurring | Level 1        
Assets        
Debt securities available-for-sale 7,908,859 7,512,171    
Trading account debt securities, excluding derivatives 5,813 2,814    
Equity securities at fair value 0 0    
Mortgage servicing rights 0 0    
Loans held-for-sale 0 0    
Derivatives 0 0    
Total assets measured at fair value on a recurring basis 7,914,672 7,514,985    
Liabilities        
Derivatives 0 0    
Total 0 0    
Recurring | Level 1 | US Treasury Securities        
Assets        
Debt securities available-for-sale 7,908,859 7,512,171    
Trading account debt securities, excluding derivatives 5,813 2,814    
Recurring | Level 1 | Obligations of Puerto Rico, States and political subdivisions        
Assets        
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 1 | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 0 0    
Recurring | Level 1 | CMO        
Assets        
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 1 | Mortgage Backed Securities        
Assets        
Debt securities available-for-sale 0 0    
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 1 | Other        
Assets        
Debt securities available-for-sale 0 0    
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 2        
Assets        
Debt securities available-for-sale 12,580,171 10,730,998    
Trading account debt securities, excluding derivatives 23,624 29,752    
Equity securities at fair value 47,009 45,664    
Mortgage servicing rights 0 0    
Loans held-for-sale 2,898 5,423    
Derivatives 24,792 26,023    
Total assets measured at fair value on a recurring basis 12,678,494 10,837,860    
Liabilities        
Derivatives (23,349) (22,832)    
Total (23,349) (22,832)    
Recurring | Level 2 | US Treasury Securities        
Assets        
Debt securities available-for-sale 7,503,937 5,482,939    
Trading account debt securities, excluding derivatives 10 10    
Recurring | Level 2 | Obligations of Puerto Rico, States and political subdivisions        
Assets        
Trading account debt securities, excluding derivatives 50 55    
Recurring | Level 2 | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 110,432 120,284    
Recurring | Level 2 | CMO        
Assets        
Trading account debt securities, excluding derivatives 615 655    
Recurring | Level 2 | Mortgage Backed Securities        
Assets        
Debt securities available-for-sale 4,965,802 5,127,775    
Trading account debt securities, excluding derivatives 22,949 29,032    
Recurring | Level 2 | Other        
Assets        
Debt securities available-for-sale 0 0    
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 3        
Assets        
Debt securities available-for-sale 1,182 2,734    
Trading account debt securities, excluding derivatives 206 217    
Equity securities at fair value 0 0    
Mortgage servicing rights 103,077 108,103    
Loans held-for-sale 0 0    
Derivatives 0 0    
Total assets measured at fair value on a recurring basis 104,465 111,054    
Liabilities        
Derivatives 0 0    
Total 0 0    
Recurring | Level 3 | US Treasury Securities        
Assets        
Debt securities available-for-sale 0 0    
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 3 | Obligations of Puerto Rico, States and political subdivisions        
Assets        
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 3 | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 0 0    
Recurring | Level 3 | CMO        
Assets        
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 3 | Mortgage Backed Securities        
Assets        
Debt securities available-for-sale 432 484    
Trading account debt securities, excluding derivatives 84 84    
Recurring | Level 3 | Other        
Assets        
Debt securities available-for-sale 750 2,250    
Trading account debt securities, excluding derivatives 122 133 $ 158  
Recurring | NAV        
Assets        
Debt securities available-for-sale 0 0    
Trading account debt securities, excluding derivatives 0 0    
Equity securities at fair value 447 381    
Mortgage servicing rights 0 0    
Loans held-for-sale 0 0    
Derivatives 0 0    
Total assets measured at fair value on a recurring basis 447 381    
Liabilities        
Derivatives 0 0    
Total 0 0    
Recurring | NAV | US Treasury Securities        
Assets        
Debt securities available-for-sale 0 0    
Trading account debt securities, excluding derivatives 0 0    
Recurring | NAV | Obligations of Puerto Rico, States and political subdivisions        
Assets        
Trading account debt securities, excluding derivatives 0 0    
Recurring | NAV | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 0 0    
Recurring | NAV | CMO        
Assets        
Trading account debt securities, excluding derivatives 0 0    
Recurring | NAV | Mortgage Backed Securities        
Assets        
Debt securities available-for-sale 0 0    
Trading account debt securities, excluding derivatives 0 0    
Recurring | NAV | Other        
Assets        
Debt securities available-for-sale 0 0    
Trading account debt securities, excluding derivatives $ 0 $ 0