Document And Entity Information
Apr. 22, 2024
Document Information [Line Items]  
Entity, Registrant Name Investar Holding Corporation
Document, Type 8-K
Document, Period End Date Apr. 22, 2024
Entity, Incorporation, State or Country Code LA
Entity, File Number 001-36522
Entity, Tax Identification Number 27-1560715
Entity, Address, Address Line One 10500 Coursey Blvd
Entity, Address, City or Town Baton Rouge
Entity, Address, State or Province LA
Entity, Address, Postal Zip Code 70816
City Area Code 225
Local Phone Number 227-2222
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock
Trading Symbol ISTR
Security Exchange Name NASDAQ
Entity, Emerging Growth Company false
Amendment Flag false
Entity, Central Index Key 0001602658