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

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- 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

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- 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: |