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Document and Entity Information Document
Nov. 03, 2021
Sep. 14, 2020
Cover [Abstract]    
Document Type   8-K
Document Period End Date Nov. 03, 2021  
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