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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Mar. 14, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Entity File Number 0-25023    
Entity Registrant Name FIRST CAPITAL, INC.    
Entity Incorporation, State or Country Code IN    
Entity Tax Identification Number 35-2056949    
Entity Address, Address Line One 220 Federal Drive, N.W.    
Entity Address, City or Town Corydon    
Entity Address, State or Province IN    
Entity Address, Postal Zip Code 47112    
City Area Code 812    
Local Phone Number 738-2198    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol FCAP    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 96.4
Entity Common Stock, Shares Outstanding (in shares)   3,355,353  
Auditor Firm ID 173    
Auditor Name Crowe LLP    
Auditor Location Louisville, Kentucky    
Entity Central Index Key 0001070296    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false