v3.26.1
Document and Entity Information Document
Jun. 22, 2026
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jun. 22, 2026
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 1825 South Grant Street, Suite 850
Entity Address, City or Town San Mateo,
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94402
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