v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Aug. 11, 2026
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 814-01563  
Entity Registrant Name BRIGHTWOOD CAPITAL CORPORATION I  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 88-1977273  
Entity Address, Address Line One 810 Seventh Avenue  
Entity Address, Address Line Two 26th Floor  
Entity Address, City or Town New York  
Entity Address State Or Province NY  
Entity Address, Postal Zip Code 10019  
City Area Code 646  
Local Phone Number 957-9525  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   41,013,061
Entity Central Index Key 0001895316  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false