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Income taxes - Components of deferred tax assets and liabilities -Subnote (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Deferred Income Tax Assets and Liabilities |  |
FDIC-assisted transaction | $ 152,665 | $ 152,665
PUERTO RICO |  |
Schedule of Deferred Income Tax Assets and Liabilities |  |
FDIC-assisted transaction | $ 152,665 | 152,665
PUERTO RICO | Other liabilities |  |
Schedule of Deferred Income Tax Assets and Liabilities |  |
FDIC-assisted transaction |  | 37,400
PUERTO RICO | Indefinite lived intangible assets |  |
Schedule of Deferred Income Tax Assets and Liabilities |  |
FDIC-assisted transaction |  | $ 32,600

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