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Fair value measurement - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Assets |  |  |
Debt securities available-for-sale | $ 18,245,903 | $ 16,729,044 |
Mortgage servicing rights | 108,103 | 118,109 | $ 128,350
Liabilities |  |  |
Derivatives | (22,832) | (21,103) |
US Treasury Securities |  |  |
Assets |  |  |
Debt securities available-for-sale | 12,995,110 | 10,747,061 |
Collateralized Mortgage Obligations - Federal agencies |  |  |
Assets |  |  |
Debt securities available-for-sale | 120,284 | 134,686 |
Other |  |  |
Assets |  |  |
Debt securities available-for-sale | 2,250 | 2,511 |
Recurring |  |  |
Assets |  |  |
Debt securities available-for-sale | 18,245,903 | 16,729,044 |
Trading account debt securities, excluding derivatives | 32,783 | 31,568 |
Equity securities at fair value | 46,045 | 38,275 |
Mortgage servicing rights | 108,103 | 118,109 |
Loans held-for-sale | 5,423 | 3,239 |
Derivatives | 26,023 | 24,419 |
Total assets measured at fair value on a recurring basis | 18,464,280 | 16,944,654 |
Liabilities |  |  |
Derivatives | (22,832) | (21,103) |
Total | (22,832) | (21,103) |
Recurring | US Treasury Securities |  |  |
Assets |  |  |
Debt securities available-for-sale | 12,995,110 | 10,747,061 |
Trading account debt securities, excluding derivatives | 2,824 | 16,859 |
Recurring | Obligations of Puerto Rico, States and political subdivisions |  |  |
Assets |  |  |
Trading account debt securities, excluding derivatives | 55 | 71 |
Recurring | Collateralized Mortgage Obligations - Federal agencies |  |  |
Assets |  |  |
Debt securities available-for-sale | 120,284 | 134,686 |
Recurring | CMO |  |  |
Assets |  |  |
Trading account debt securities, excluding derivatives | 655 | 98 |
Recurring | Mortgage Backed Securities |  |  |
Assets |  |  |
Debt securities available-for-sale | 5,128,259 | 5,844,786 |
Trading account debt securities, excluding derivatives | 29,116 | 14,373 |
Recurring | Other |  |  |
Assets |  |  |
Debt securities available-for-sale | 2,250 | 2,511 |
Trading account debt securities, excluding derivatives | 133 | 167 |
Recurring | Level 1 |  |  |
Assets |  |  |
Debt securities available-for-sale | 7,512,171 | 3,936,036 |
Trading account debt securities, excluding derivatives | 2,814 | 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 a recurring basis | 7,514,985 | 3,952,895 |
Liabilities |  |  |
Derivatives | 0 | 0 |
Total | 0 | 0 |
Recurring | Level 1 | US Treasury Securities |  |  |
Assets |  |  |
Debt securities available-for-sale | 7,512,171 | 3,936,036 |
Trading account debt securities, excluding derivatives | 2,814 | 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 |  |  |
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 | 10,730,998 | 12,789,902 |
Trading account debt securities, excluding derivatives | 29,752 | 14,425 |
Equity securities at fair value | 45,664 | 37,965 |
Mortgage servicing rights | 0 | 0 |
Loans held-for-sale | 5,423 | 3,239 |
Derivatives | 26,023 | 24,419 |
Total assets measured at fair value on a recurring basis | 10,837,860 | 12,869,950 |
Liabilities |  |  |
Derivatives | (22,832) | (21,103) |
Total | (22,832) | (21,103) |
Recurring | Level 2 | US Treasury Securities |  |  |
Assets |  |  |
Debt securities available-for-sale | 5,482,939 | 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 | 55 | 71 |
Recurring | Level 2 | Collateralized Mortgage Obligations - Federal agencies |  |  |
Assets |  |  |
Debt securities available-for-sale | 120,284 | 134,686 |
Recurring | Level 2 | CMO |  |  |
Assets |  |  |
Trading account debt securities, excluding derivatives | 655 | 93 |
Recurring | Level 2 | Mortgage Backed Securities |  |  |
Assets |  |  |
Debt securities available-for-sale | 5,127,775 | 5,844,180 |
Trading account debt securities, excluding derivatives | 29,032 | 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 | 2,734 | 3,106 |
Trading account debt securities, excluding derivatives | 217 | 284 |
Equity securities at fair value | 0 | 0 |
Mortgage servicing rights | 108,103 | 118,109 |
Loans held-for-sale | 0 | 0 |
Derivatives | 0 | 0 |
Total assets measured at fair value on a recurring basis | 111,054 | 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 |
Recurring | Level 3 | Mortgage Backed Securities |  |  |
Assets |  |  |
Debt securities available-for-sale | 484 | 606 |
Trading account debt securities, excluding derivatives | 84 | 112 |
Recurring | Level 3 | Other |  |  |
Assets |  |  |
Debt securities available-for-sale | 2,250 | 2,500 |
Trading account debt securities, excluding derivatives | 133 | 167 |
Recurring | NAV |  |  |
Assets |  |  |
Debt securities available-for-sale | 0 | 0 |
Trading account debt securities, excluding derivatives | 0 | 0 |
Equity securities at fair value | 381 | 310 |
Mortgage servicing rights | 0 | 0 |
Loans held-for-sale | 0 | 0 |
Derivatives | 0 | 0 |
Total assets measured at fair value on a recurring basis | 381 | 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 |  |  |
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 |

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