Document and Entity Information	6 Months Ended
	Jun. 30, 2011	Aug. 05, 2011
Document and Entity Information
Entity Registrant Name	FIRST FINANCIAL CORP /IN/
Entity Central Index Key	0000714562
Document Type	10-Q
Document Period End Date	Jun. 30, 2011
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		13,151,630
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2