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Revenue - Loan Servicing Rights (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Net gain (loss) related to loan servicing rights	$ (67)	$ 1,459

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- Definition

Net Gain (Loss) Related To Loan Servicing Rights

+ References

No definition available.

+ Details

Name:	upst_NetGainLossRelatedToLoanServicingRights
Namespace Prefix:	upst_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration