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Acquisitions and FDIC Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Business Acquisition [Line Items] |  |
Loans | $ 22,326 | $ 27,754
Foreclosed Assets | 253 | 720
Total Covered Assets | 22,579 | 28,474
ASC 310-30 Loans [Member] |  |
Business Acquisition [Line Items] |  |
Loans | 2,969 | 4,279
Foreclosed Assets | 0 | 0
Total Covered Assets | 2,969 | 4,279
Non ASC 310-30 Loans [Member] |  |
Business Acquisition [Line Items] |  |
Loans | 19,357 | 23,475
Foreclosed Assets | 0 | 0
Total Covered Assets | 19,357 | 23,475
Other Assets [Member] |  |
Business Acquisition [Line Items] |  |
Loans | 0 | 0
Foreclosed Assets | 253 | 720
Total Covered Assets | $ 253 | $ 720

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 Represents the carrying amount as of the balance sheet date of all 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_CoveredForeclosedAssets
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 Net carrying amount of loans and leases receivable covered by loss sharing agreements. + References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableNetReportedAmountCovered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant