v3.26.1
Cover Page - shares
6 Months Ended
Jun. 30, 2026
Aug. 12, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-43359  
Entity Registrant Name First Carolina Financial Services, Inc.  
Entity Incorporation, State or Country Code NC  
Entity Tax Identification Number 27-2136973  
Entity Address, Address Line One 2626 Glenwood Avenue  
Entity Address, Address Line Two Suite 520  
Entity Address, City or Town Raleigh  
Entity Address, State or Province NC  
Entity Address, Postal Zip Code 27608  
City Area Code 252  
Local Phone Number 937-2152  
Title of 12(b) Security Common stock, par value $0.50 per share  
Trading Symbol FCBM  
Security Exchange Name NYSE  
Entity Current Reporting Status No  
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   31,068,852
Amendment Flag false  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001531193