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Acquisitions and FDIC Indemnification Asset (Details Textual) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |
Goodwill | $ 39,489,000 us-gaap_Goodwill | $ 39,489,000 us-gaap_Goodwill
Loans and Leases Receivable, Net of Loans with Deteriorated Credit Quality, Covered | 6,700,000 thff_LoansandLeasesReceivableNetofLoanswithDeterioratedCreditQualityCovered | 7,300,000 thff_LoansandLeasesReceivableNetofLoanswithDeterioratedCreditQualityCovered
First National Bank Of Danville [Member] |  |
Business Acquisition [Line Items] |  |
Reimbursements from the FDIC | 19,400,000 us-gaap_FDICIndemnificationAssetCashPaymentsReceived / us-gaap_BusinessAcquisitionAxis = thff_FirstNationalBankOfDanvilleMember |
Business Aquisition, Loss Sharing Agreement Losses On Assets Threshold | $ 29,000,000 thff_BusinessAquisitionLossSharingAgreementLossesOnAssetsThreshold / us-gaap_BusinessAcquisitionAxis = thff_FirstNationalBankOfDanvilleMember |
Business Acquisition Loss Sharing Agreement Losses In Excess Of Threshold To Be Reimbursed Percentage | 95.00%thff_BusinessAcquisitionLossSharingAgreementLossesInExcessOfThresholdToBeReimbursedPercentage / us-gaap_BusinessAcquisitionAxis = thff_FirstNationalBankOfDanvilleMember |
Business Acquisition, Loss Sharing Agreement Losses Up To Threshold To Be Reimbursed Percentage | 80.00%thff_BusinessAcquisitionLossSharingAgreementLossesUpToThresholdToBeReimbursedPercentage / us-gaap_BusinessAcquisitionAxis = thff_FirstNationalBankOfDanvilleMember |

X
- Definition Represents the percentage of losses on assets acquired under business combination and covered under loss-sharing agreement, to be reimbursed by FDIC, if losses exceed the threshold amount. + References No definition available. + Details
Name: | thff_BusinessAcquisitionLossSharingAgreementLossesInExcessOfThresholdToBeReimbursedPercentage
Namespace Prefix: | thff_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of losses on assets acquired under business combination and covered under loss-sharing agreement, to be reimbursed by FDIC, if losses are up to the threshold amount. + References No definition available. + Details
Name: | thff_BusinessAcquisitionLossSharingAgreementLossesUpToThresholdToBeReimbursedPercentage
Namespace Prefix: | thff_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the threshold amount of losses on assets acquired in a business combination to calculate the amount of reimbursement under the loss-sharing agreement. + References No definition available. + Details
Name: | thff_BusinessAquisitionLossSharingAgreementLossesOnAssetsThreshold
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Loans and Leases Receivable, Net of Loans with Deteriorated Credit Quality, Covered + References No definition available. + Details
Name: | thff_LoansandLeasesReceivableNetofLoanswithDeterioratedCreditQualityCovered
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 decreases to the indemnification asset due to cash payments received relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |