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Allowance for Credit Losses - Modified loans with payment default (Details)	6 Months Ended
	Jun. 30, 2025
ALLOWANCE FOR LOAN LOSSES
Modified loans past due period considered in payment default	30 days

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- Definition

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

+ References

No definition available.

+ Details

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

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- Definition

Threshold period for when financing receivable is considered in default under modified terms, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	thff_FinancingReceivableThresholdPeriodDefaultModifiedTerms
Namespace Prefix:	thff_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration