v3.26.3
Cover
Sep. 14, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Sep. 14, 2026
Entity File Number 001-43359
Entity Registrant Name First Carolina Financial Services, Inc.
Entity Central Index Key 0001531193
Entity Tax Identification Number 27-2136973
Entity Incorporation, State or Country Code NC
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, par value $0.50 per share
Trading Symbol FCBM
Security Exchange Name NYSE
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false