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OTHER BORROWINGS: (Tables)

12 Months Ended

Dec. 31, 2018

Other Borrowings Disclosure [Abstract]

Schedule of other borrowings

Aggregate Minimum Annual Retirements

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

No definition available.

Name:	thff_AggregateMinimumAnnualRetirementsOfOtherBorrowingsTableTextBlock
Namespace Prefix:	thff_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

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

Tabular disclosure of debt arrangements (having initial terms of repayment in excess of one year or the normal operating cycle, if longer).

No definition available.

Name:	thff_ScheduleOfOtherBorrowingsTableTextBlock
Namespace Prefix:	thff_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration