v3.26.1
Organization, Description of Business and Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Jan. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2026
client
issuer
$ / shares
shares
Jun. 30, 2025
client
$ / shares
shares
Dec. 31, 2025
Summary of Significant Accounting Policies          
Number of issuers of credit card receivable | issuer     2    
Common stock, shares outstanding, after reorganization   64,060,082   64,060,082  
Shares repurchased | $ $ 58.9        
Purchased Receivables | Purchase concentration | Top five clients          
Summary of Significant Accounting Policies          
Number of major suppliers | client     5 5  
Concentration risk percentage     40.70% 41.00%  
Purchased Receivables | Purchase concentration | Top client          
Summary of Significant Accounting Policies          
Concentration risk percentage     9.50% 12.30%  
Class B units          
Summary of Significant Accounting Policies          
Vesting period   3 years      
JCAP TopCo, LLC [Member] | Class A And Class C Units          
Summary of Significant Accounting Policies          
Number of units outstanding     132,828,019    
JCAP TopCo, LLC [Member] | Class B units          
Summary of Significant Accounting Policies          
Number of units outstanding   27,937,232   27,937,232  
IPO          
Summary of Significant Accounting Policies          
Offering price | $ / shares   $ 15 $ 15 $ 15  
Net proceeds | $   $ 4.5      
Shares issued (in shares)   625,000      
Sale of Stock, Number of Shares Issued in Transaction   10,875,000      
JCAP TopCo, LLC [Member]          
Summary of Significant Accounting Policies          
Exchange ratio of stock     2.4150549    
JCAP TopCo, LLC [Member] | Class A And Class C Units          
Summary of Significant Accounting Policies          
Shares Issued, Conversion of stock     55,000,000    
JCAP TopCo, LLC [Member] | Class B units          
Summary of Significant Accounting Policies          
Shares Issued, Conversion of stock   9,060,082      
JCAP TopCo, LLC [Member] | Class B units | Management Stockholders          
Summary of Significant Accounting Policies          
Shares Issued, Conversion of stock   6,418,775      
Jefferson Capital Holdings, LLC | JCF Stockholders          
Summary of Significant Accounting Policies          
Ownership percentage     53.10%   67.60%
Jefferson Capital Holdings, LLC | Management Stockholders          
Summary of Significant Accounting Policies          
Ownership percentage, Noncontrolling owner     14.50%    
Jefferson Capital Holdings, LLC | IPO | Investors          
Summary of Significant Accounting Policies          
Ownership percentage, Noncontrolling owner     32.40%    
Jefferson Capital Holdings, LLC | JCAP TopCo, LLC [Member]          
Summary of Significant Accounting Policies          
Ownership percentage   100.00%   100.00%  
JCAP TopCo, LLC [Member]          
Summary of Significant Accounting Policies          
Ownership percentage   100.00%   100.00%