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Guarantees - Changes from credit recourses agreements (Details) - Guarantee on loans sold or serviced with credit recourse - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Guarantor Obligations |  |
Balance as of beginning of period | $ 22,484 | $ 34,862
Impact of adopting CECL | 0 | (3,831)
Provision (reversal) for recourse liability | (2,948) | (104)
Net charge-offs | (7,736) | (8,443)
Balance as of end of period | $ 11,800 | $ 22,484

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