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Cover - USD ($)
 12 Months Ended
Dec. 31, 2022
Mar. 01, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Document Transition Report false    
Entity File Number 0-16759    
Entity Registrant Name FIRST FINANCIAL CORPORATION    
Entity Incorporation, State or Country Code IN    
Entity Tax Identification Number 35-1546989    
Entity Address, Address Line One One First Financial Plaza    
Entity Address, City or Town Terre Haute    
Entity Address, State or Province IN    
Entity Address, Postal Zip Code 47807    
City Area Code 812    
Local Phone Number 238-6000    
Title of 12(b) Security Common Stock, par value $0.125 per share    
Trading Symbol THFF    
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 Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 490,666,197
Entity Common Stock, Shares Outstanding   12,065,888  
Documents Incorporated by Reference

Portions of the Definitive Proxy Statement for the First Financial Corporation Annual Meeting of Shareholders to be held April 19, 2023 are incorporated by reference into Part III.

    
Entity Central Index Key 0000714562    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Amendment Flag false    
ICFR Auditor Attestation Flag true    
Auditor Name Crowe LLP    
Auditor Location Indianapolis, Indiana    
Auditor Firm ID 173