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Document and Entity Information
Aug. 14, 2025
Document and Entity Information [Abstract]  
Document Type 8-K
Document Period End Date Aug. 14, 2025
Entity Registrant Name Jefferson Capital, Inc. / DE
Entity Incorporation, State or Country Code DE
Entity File Number 001-42718
Entity Tax Identification Number 33-1923926
Entity Address, Address Line One 600 SOUTH HIGHWAY 169
Entity Address, Adress Line Two SUITE 1575
Entity Address, City or Town MINNEAPOLIS
Entity Address State Or Province MN
Entity Address, Postal Zip Code 55426
City Area Code 320
Local Phone Number 229-8505
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 JCAP
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Central Index Key 0002046042
Amendment Flag false