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Document and Entity Information Document
Apr. 06, 2022
Sep. 14, 2020
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Mar. 31, 2022  
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