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Fair Value (Details 4) (Level 3, USD $) | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Loans identified as impaired by class of loans |  |
Unpaid Principal Balance | $ 25,959,000 | $ 32,650,000
Allowance for Loan Losses Allocated | 4,570,000 | 4,273,000
Fair value | 21,389,000 | 28,377,000
Commercial & Industrial |  |
Loans identified as impaired by class of loans |  |
Unpaid Principal Balance | 18,060,000 | 17,890,000
Allowance for Loan Losses Allocated | 4,040,000 | 2,664,000
Fair value | 14,020,000 | 15,226,000
Farmland |  |
Loans identified as impaired by class of loans |  |
Unpaid Principal Balance | 891,000 | 891,000
Allowance for Loan Losses Allocated | 49,000 | 49,000
Fair value | 842,000 | 842,000
Non Farm, Non Residential |  |
Loans identified as impaired by class of loans |  |
Unpaid Principal Balance | 4,484,000 | 9,260,000
Allowance for Loan Losses Allocated | 198,000 | 957,000
Fair value | 4,286,000 | 8,303,000
All Other Commercial |  |
Loans identified as impaired by class of loans |  |
Unpaid Principal Balance | 1,311,000 | 1,517,000
Allowance for Loan Losses Allocated | 93,000 | 66,000
Fair value | 1,218,000 | 1,451,000
First Liens |  |
Loans identified as impaired by class of loans |  |
Unpaid Principal Balance | 1,213,000 | 1,963,000
Allowance for Loan Losses Allocated | 190,000 | 190,000
Fair value | 1,023,000 | 1,773,000
Junior Liens |  |
Loans identified as impaired by class of loans |  |
Unpaid Principal Balance |  | 879,000
Allowance for Loan Losses Allocated |  | 347,000
Fair value |  | 532,000
Multifamily |  |
Loans identified as impaired by class of loans |  |
Unpaid Principal Balance |  | 250,000
Fair value |  | $ 250,000

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- Definition Represents the estimated fair value of the recorded investments related to impaired financing receivables. + References No definition available. + Details
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Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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Balance Type: | debit
Period Type: | instant