v3.26.1
Cover Page - shares
 3 Months Ended
Mar. 31, 2026
Apr. 29, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-42111  
Entity Registrant Name Bowhead Specialty Holdings Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 87-1433334  
Entity Address, Address Line One 452 Fifth Avenue  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10018  
City Area Code 212  
Local Phone Number 970-0269  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol BOW  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category 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   32,838,035
Entity Central Index Key 0002002473  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Amendment Flag false