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Fair value measurement - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Assets |  |  |  |
Debt securities available-for-sale | $ 16,729,044 | $ 17,804,374 |  |
Mortgage servicing rights | 118,109 | 128,350 | $ 128,350 | $ 121,570
Liabilities |  |  |  |
Derivatives | (21,103) | (17,000) |  |
US Treasury Securities |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 10,747,061 | 11,180,948 |  |
Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 134,686 | 165,196 |  |
Mortgage Backed Securities |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 5,844,786 | 6,457,170 |  |
Other |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 2,511 | 1,060 |  |
Recurring |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 16,729,044 | 17,804,374 |  |
Trading account debt securities, excluding derivatives | 31,568 | 27,723 |  |
Equity securities at fair value | 38,275 | 29,632 |  |
Mortgage servicing rights | 118,109 | 128,350 |  |
Loans held-for-sale | 3,239 |  |  |
Derivatives | 24,419 | 19,229 |  |
Total assets measured at fair value on recurring /nonrecurring basis | 16,944,654 | 18,009,308 |  |
Liabilities |  |  |  |
Derivatives | (21,103) | (17,000) |  |
Total | (21,103) | (17,000) |  |
Recurring | US Treasury Securities |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 10,747,061 | 11,180,948 |  |
Trading account debt securities, excluding derivatives | 16,859 | 13,069 |  |
Recurring | Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Assets |  |  |  |
Trading account debt securities, excluding derivatives | 71 | 64 |  |
Recurring | Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 134,686 | 165,196 |  |
Recurring | CMO |  |  |  |
Assets |  |  |  |
Trading account debt securities, excluding derivatives | 98 | 160 |  |
Recurring | Mortgage Backed Securities |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 5,844,786 | 6,457,170 |  |
Trading account debt securities, excluding derivatives | 14,373 | 14,223 |  |
Recurring | Other |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 2,511 | 1,060 |  |
Trading account debt securities, excluding derivatives | 167 | 207 |  |
Recurring | Level 1 |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 3,936,036 | 1,908,589 |  |
Trading account debt securities, excluding derivatives | 16,859 | 13,069 |  |
Equity securities at fair value | 0 | 0 |  |
Mortgage servicing rights | 0 | 0 |  |
Loans held-for-sale | 0 |  |  |
Derivatives | 0 | 0 |  |
Total assets measured at fair value on recurring /nonrecurring basis | 3,952,895 | 1,921,658 |  |
Liabilities |  |  |  |
Derivatives | 0 | 0 |  |
Total | 0 | 0 |  |
Recurring | Level 1 | US Treasury Securities |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 3,936,036 | 1,908,589 |  |
Trading account debt securities, excluding derivatives | 16,859 | 13,069 |  |
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 | 12,789,902 | 15,894,074 |  |
Trading account debt securities, excluding derivatives | 14,425 | 14,119 |  |
Equity securities at fair value | 37,965 | 29,302 |  |
Mortgage servicing rights | 0 | 0 |  |
Loans held-for-sale | 3,239 |  |  |
Derivatives | 24,419 | 19,229 |  |
Total assets measured at fair value on recurring /nonrecurring basis | 12,869,950 | 15,956,724 |  |
Liabilities |  |  |  |
Derivatives | (21,103) | (17,000) |  |
Total | (21,103) | (17,000) |  |
Recurring | Level 2 | US Treasury Securities |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 6,811,025 | 9,272,359 |  |
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 | 71 | 64 |  |
Recurring | Level 2 | Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 134,686 | 165,196 |  |
Recurring | Level 2 | CMO |  |  |  |
Assets |  |  |  |
Trading account debt securities, excluding derivatives | 93 | 47 |  |
Recurring | Level 2 | Mortgage Backed Securities |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 5,844,180 | 6,456,459 |  |
Trading account debt securities, excluding derivatives | 14,261 | 14,008 |  |
Recurring | Level 2 | Other |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 11 | 60 |  |
Trading account debt securities, excluding derivatives | 0 | 0 |  |
Recurring | Level 3 |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 3,106 | 1,711 |  |
Trading account debt securities, excluding derivatives | 284 | 535 |  |
Equity securities at fair value | 0 | 0 |  |
Mortgage servicing rights | 118,109 | 128,350 |  |
Loans held-for-sale | 0 |  |  |
Derivatives | 0 | 0 |  |
Total assets measured at fair value on recurring /nonrecurring basis | 121,499 | 130,596 |  |
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 | 5 | 113 |  |
Recurring | Level 3 | Mortgage Backed Securities |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 606 | 711 |  |
Trading account debt securities, excluding derivatives | 112 | 215 |  |
Recurring | Level 3 | Other |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 2,500 | 1,000 |  |
Trading account debt securities, excluding derivatives | 167 | 207 |  |
Recurring | NAV |  |  |  |
Assets |  |  |  |
Debt securities available-for-sale | 0 | 0 |  |
Trading account debt securities, excluding derivatives | 0 | 0 |  |
Equity securities at fair value | 310 | 330 |  |
Mortgage servicing rights | 0 | 0 |  |
Loans held-for-sale | 0 |  |  |
Derivatives | 0 | 0 |  |
Total assets measured at fair value on recurring /nonrecurring basis | 310 | 330 |  |
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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