Document and Entity Information Document
Jul. 08, 2020
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jul. 08, 2020
Entity Registrant Name OPORTUN FINANCIAL CORPORATION
Entity Central Index Key 0001538716
Amendment Flag false
Entity File Number 001-39050
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 45-3361983
Entity Address, Address Line One 2 Circle Star Way
Entity Address, City or Town San Carlos,
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94070
City Area Code 650
Local Phone Number 810-8823
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.0001 par value per share
Trading Symbol OPRT
Security Exchange Name NASDAQ
Entity Emerging Growth Company false