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Acquisitions and FDIC Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$ 6,374us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered	$ 10,085us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
Loans and Leases Receivable, Allowance, Covered	0us-gaap_LoansAndLeasesReceivableAllowanceCovered	0us-gaap_LoansAndLeasesReceivableAllowanceCovered
Loans and Leases Receivable, Disposals	(115)thff_LoansandLeasesReceivableDisposals	(174)thff_LoansandLeasesReceivableDisposals
Total Covered Assets	6,259thff_CoveredAssets	9,911thff_CoveredAssets
Consumer Loan [Member]
Business Acquisition [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	1,571us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember	2,409us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Loans and Leases Receivable, Allowance, Covered	0us-gaap_LoansAndLeasesReceivableAllowanceCovered / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember	0us-gaap_LoansAndLeasesReceivableAllowanceCovered / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Loans and Leases Receivable, Disposals	(13)thff_LoansandLeasesReceivableDisposals / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember	(8)thff_LoansandLeasesReceivableDisposals / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Total Covered Assets	1,558thff_CoveredAssets / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember	2,401thff_CoveredAssets / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Commercial Loan [Member]
Business Acquisition [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	4,803us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember	7,676us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Loans and Leases Receivable, Allowance, Covered	0us-gaap_LoansAndLeasesReceivableAllowanceCovered / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember	0us-gaap_LoansAndLeasesReceivableAllowanceCovered / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Loans and Leases Receivable, Disposals	(102)thff_LoansandLeasesReceivableDisposals / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember	(166)thff_LoansandLeasesReceivableDisposals / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Total Covered Assets	$ 4,701thff_CoveredAssets / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember	$ 7,510thff_CoveredAssets / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember

X

- Definition

Represents the carrying amount of all categories of financing receivables held in portfolio and assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance, whose losses will be shared with the Federal Deposit Insurance Corporation under the loss-sharing agreement.

+ References

No definition available.

+ Details

Name:	thff_CoveredAssets
Namespace Prefix:	thff_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Loans and Leases Receivable, Disposals

+ References

No definition available.

+ Details

Name:	thff_LoansandLeasesReceivableDisposals
Namespace Prefix:	thff_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of allowance for loan and lease losses covered by loss sharing agreements.

+ References

No definition available.

+ Details

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

X

- Definition

Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: