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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 | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Guarantor Obligations [Line Items] |  |  |  |
Balance as of beginning of period | $ 2,078 | $ 3,122 | $ 2,297 | $ 3,212
Provision (reversal) for representations and warranties | (79) | (125) | (298) | (215)
Balance as of end of period | $ 1,999 | $ 2,997 | $ 1,999 | $ 2,997

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