| Cover | Feb. 28, 2025 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 28, 2025 |
| Registrant Name | Bowhead Specialty Holdings Inc. |
| 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 |
| Local Phone Number | 970-0269 |
| City Area Code | 212 |
| Entity File Number | 001-42111 |
| Entity Tax Identification Number | 87-1433334 |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Incorporation, State or Country Code | DE |
| Written Communications | false |
| Trading Symbol | BOW |
| Security Exchange Name | NYSE |
| Central Index Key | 0002002473 |
| Amendment Flag | false |
