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OTHER BORROWINGS: (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Borrowings Disclosure [Abstract]
FHLB advances	$ 0	$ 0

X

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

Name:	thff_OtherBorrowingsDisclosureAbstract
Namespace Prefix:	thff_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

+ Details

Name:	us-gaap_AdvancesFromFederalHomeLoanBanks
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant