    <SEC-DOCUMENT>0000714562-21-000066-index.html : 20210908
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    <ACCEPTANCE-DATETIME>20210908150906
    ACCESSION NUMBER:		0000714562-21-000066
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		40
    CONFORMED PERIOD OF REPORT:	20210908
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20210908
    DATE AS OF CHANGE:		20210908

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			FIRST FINANCIAL CORP /IN/
    		CENTRAL INDEX KEY:			0000714562
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		IRS NUMBER:				351546989
    		STATE OF INCORPORATION:			IN
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-16759
    		FILM NUMBER:		211241753

    	BUSINESS ADDRESS:
    		STREET 1:		ONE FIRST FINANCIAL PLAZA
    		CITY:			TERRE HAUTE
    		STATE:			IN
    		ZIP:			47807
    		BUSINESS PHONE:		(812) 238-6000

    	MAIL ADDRESS:
    		STREET 1:		ONE FIRST FINANCIAL PLAZA
    		CITY:			TERRE HAUTE
    		STATE:			IN
    		ZIP:			47807

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	TERRE HAUTE FIRST CORP
    		DATE OF NAME CHANGE:	19850808
    </SEC-HEADER>
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    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>thff-20210908.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: thff-20210908.htm

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    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>investormeeting.htm
    <DESCRIPTION>EX-99.1
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    Document 2 - file: investormeeting.htm

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    <TYPE>EX-101.SCH
    <SEQUENCE>3
    <FILENAME>thff-20210908.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
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    <SEQUENCE>26
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    Document 26 - file: investormeeting021.jpg

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    <SEQUENCE>27
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    <SEQUENCE>28
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    <SEQUENCE>29
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    Document 29 - file: investormeeting024.jpg

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    <SEQUENCE>30
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    <DESCRIPTION>GRAPHIC
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    Document 30 - file: investormeeting025.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>investormeeting026.jpg
    <DESCRIPTION>GRAPHIC
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    Document 31 - file: investormeeting026.jpg

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    <DOCUMENT>
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    <SEQUENCE>32
    <FILENAME>investormeeting027.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 32 - file: investormeeting027.jpg

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    <TYPE>XML
    <SEQUENCE>33
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    <DESCRIPTION>IDEA: XBRL DOCUMENT
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    Document 33 - RAW XML: thff-20210908_htm.xml

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    <TYPE>EXCEL
    <SEQUENCE>35
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    Document 35 - file: Financial_Report.xlsx

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