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Guarantees - Changes from customary respresentations and warranties related to loans sold by BPPR (Details) - Indemnification Guarantee - Banco Popular de Puerto Rico - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Guarantor Obligations [Line Items] |  |
Balance as of beginning of period | $ 2,297 | $ 3,212
Provision (reversal) for representations and warranties | (119) | (69)
Balance as of end of period | $ 2,178 | $ 3,143

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