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Fair value measurement - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Assets        
Debt securities available-for-sale $ 18,017,424 $ 16,729,044    
Mortgage servicing rights 114,964 118,109 $ 127,475 $ 128,350
US Treasury Securities        
Assets        
Debt securities available-for-sale 12,289,211 10,747,061    
Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 127,608 134,686    
Mortgage Backed Securities - federal agencies        
Assets        
Debt securities available-for-sale 5,598,600 5,844,786    
Other        
Assets        
Debt securities available-for-sale 2,005 2,511    
Recurring        
Assets        
Debt securities available-for-sale 18,017,424 16,729,044    
Trading account debt securities, excluding derivatives 27,303 31,568    
Equity securities at fair value 41,269 38,275    
Mortgage servicing rights 114,964 118,109    
Loans held-for-sale 5,352 3,239    
Derivatives 24,045 24,419    
Total assets measured at fair value on recurring /nonrecurring basis 18,230,357 16,944,654    
Liabilities        
Derivatives (21,784) (21,103)    
Total (21,784) (21,103)    
Recurring | US Treasury Securities        
Assets        
Debt securities available-for-sale 12,289,211 10,747,061    
Trading account debt securities, excluding derivatives 8,316 16,859    
Recurring | Obligations of Puerto Rico, States and political subdivisions        
Assets        
Trading account debt securities, excluding derivatives 60 71    
Recurring | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 127,608 134,686    
Recurring | CMO        
Assets        
Trading account debt securities, excluding derivatives 90 98    
Recurring | Mortgage Backed Securities - federal agencies        
Assets        
Debt securities available-for-sale 5,598,600 5,844,786    
Trading account debt securities, excluding derivatives 18,671 14,373    
Recurring | Other        
Assets        
Debt securities available-for-sale 2,005 2,511    
Trading account debt securities, excluding derivatives 166 167    
Recurring | Level 1        
Assets        
Debt securities available-for-sale 6,262,480 3,936,036    
Trading account debt securities, excluding derivatives 8,316 16,859    
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 recurring /nonrecurring basis 6,270,796 3,952,895    
Liabilities        
Derivatives 0 0    
Total 0 0    
Recurring | Level 1 | US Treasury Securities        
Assets        
Debt securities available-for-sale 6,262,480 3,936,036    
Trading account debt securities, excluding derivatives 8,316 16,859    
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 - federal agencies        
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 11,752,337 12,789,902    
Trading account debt securities, excluding derivatives 18,737 14,425    
Equity securities at fair value 40,933 37,965    
Mortgage servicing rights 0 0    
Loans held-for-sale 5,352 3,239    
Derivatives 24,045 24,419    
Total assets measured at fair value on recurring /nonrecurring basis 11,841,404 12,869,950    
Liabilities        
Derivatives (21,784) (21,103)    
Total (21,784) (21,103)    
Recurring | Level 2 | US Treasury Securities        
Assets        
Debt securities available-for-sale 6,026,731 6,811,025    
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 2 | Obligations of Puerto Rico, States and political subdivisions        
Assets        
Trading account debt securities, excluding derivatives 60 71    
Recurring | Level 2 | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 127,608 134,686    
Recurring | Level 2 | CMO        
Assets        
Trading account debt securities, excluding derivatives 90 93    
Recurring | Level 2 | Mortgage Backed Securities - federal agencies        
Assets        
Debt securities available-for-sale 5,597,993 5,844,180    
Trading account debt securities, excluding derivatives 18,587 14,261    
Recurring | Level 2 | Other        
Assets        
Debt securities available-for-sale 5 11    
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 3        
Assets        
Debt securities available-for-sale 2,607 3,106    
Trading account debt securities, excluding derivatives 250 284    
Equity securities at fair value 0 0    
Mortgage servicing rights 114,964 118,109    
Loans held-for-sale 0 0    
Derivatives 0 0    
Total assets measured at fair value on recurring /nonrecurring basis 117,821 121,499    
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 5 88  
Recurring | Level 3 | Mortgage Backed Securities - federal agencies        
Assets        
Debt securities available-for-sale 607 606    
Trading account debt securities, excluding derivatives 84 112    
Recurring | Level 3 | Other        
Assets        
Debt securities available-for-sale 2,000 2,500    
Trading account debt securities, excluding derivatives 166 167 $ 199  
Recurring | NAV        
Assets        
Debt securities available-for-sale 0 0    
Trading account debt securities, excluding derivatives 0 0    
Equity securities at fair value 336 310    
Mortgage servicing rights 0 0    
Loans held-for-sale 0 0    
Derivatives 0 0    
Total assets measured at fair value on recurring /nonrecurring basis 336 310    
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 - federal agencies        
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