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Fair value measurement - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Assets        
Debt securities available-for-sale $ 17,186,123 $ 16,729,044    
Mortgage servicing rights 108,827 118,109 $ 119,030 $ 128,350
US Treasury Securities        
Assets        
Debt securities available-for-sale 11,524,430 10,747,061    
Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 128,553 134,686    
Mortgage Backed Securities - federal agencies        
Assets        
Debt securities available-for-sale 5,531,140 5,844,786    
Other        
Assets        
Debt securities available-for-sale 2,000 2,511    
Recurring        
Assets        
Debt securities available-for-sale 17,186,123 16,729,044    
Trading account debt securities, excluding derivatives 30,836 31,568    
Equity securities at fair value 46,633 38,275    
Mortgage servicing rights 108,827 118,109    
Loans held-for-sale 5,509 3,239    
Derivatives 25,941 24,419    
Total assets measured at fair value on recurring /nonrecurring basis 17,403,869 16,944,654    
Liabilities        
Derivatives (23,608) (21,103)    
Total (23,608) (21,103)    
Recurring | US Treasury Securities        
Assets        
Debt securities available-for-sale 11,524,430 10,747,061    
Trading account debt securities, excluding derivatives 7,685 16,859    
Recurring | Obligations of Puerto Rico, States and political subdivisions        
Assets        
Trading account debt securities, excluding derivatives 58 71    
Recurring | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 128,553 134,686    
Recurring | CMO        
Assets        
Trading account debt securities, excluding derivatives 132 98    
Recurring | Mortgage Backed Securities - federal agencies        
Assets        
Debt securities available-for-sale 5,531,140 5,844,786    
Trading account debt securities, excluding derivatives 22,807 14,373    
Recurring | Other        
Assets        
Debt securities available-for-sale 2,000 2,511    
Trading account debt securities, excluding derivatives 154 167    
Recurring | Level 1        
Assets        
Debt securities available-for-sale 5,879,911 3,936,036    
Trading account debt securities, excluding derivatives 7,675 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 5,887,586 3,952,895    
Liabilities        
Derivatives 0 0    
Total 0 0    
Recurring | Level 1 | US Treasury Securities        
Assets        
Debt securities available-for-sale 5,879,911 3,936,036    
Trading account debt securities, excluding derivatives 7,675 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 11,303,654 12,789,902    
Trading account debt securities, excluding derivatives 22,923 14,425    
Equity securities at fair value 46,248 37,965    
Mortgage servicing rights 0 0    
Loans held-for-sale 5,509 3,239    
Derivatives 25,941 24,419    
Total assets measured at fair value on recurring /nonrecurring basis 11,404,275 12,869,950    
Liabilities        
Derivatives (23,608) (21,103)    
Total (23,608) (21,103)    
Recurring | Level 2 | US Treasury Securities        
Assets        
Debt securities available-for-sale 5,644,519 6,811,025    
Trading account debt securities, excluding derivatives 10 0    
Recurring | Level 2 | Obligations of Puerto Rico, States and political subdivisions        
Assets        
Trading account debt securities, excluding derivatives 58 71    
Recurring | Level 2 | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale 128,553 134,686    
Recurring | Level 2 | CMO        
Assets        
Trading account debt securities, excluding derivatives 132 93    
Recurring | Level 2 | Mortgage Backed Securities - federal agencies        
Assets        
Debt securities available-for-sale 5,530,582 5,844,180    
Trading account debt securities, excluding derivatives 22,723 14,261    
Recurring | Level 2 | Other        
Assets        
Debt securities available-for-sale 0 11    
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 3        
Assets        
Debt securities available-for-sale 2,558 3,106    
Trading account debt securities, excluding derivatives 238 284    
Equity securities at fair value 0 0    
Mortgage servicing rights 108,827 118,109    
Loans held-for-sale 0 0    
Derivatives 0 0    
Total assets measured at fair value on recurring /nonrecurring basis 111,623 121,499    
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 10  
Recurring | Level 3 | Mortgage Backed Securities - federal agencies        
Assets        
Debt securities available-for-sale 558 606    
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 154 167 $ 188  
Recurring | NAV        
Assets        
Debt securities available-for-sale 0 0    
Trading account debt securities, excluding derivatives 0 0    
Equity securities at fair value 385 310    
Mortgage servicing rights 0 0    
Loans held-for-sale 0 0    
Derivatives 0 0    
Total assets measured at fair value on recurring /nonrecurring basis 385 310    
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