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Fair Value (Details 3) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Loans identified as impaired by class of loans |  |
Carrying Value | $ 22,934 | $ 33,557
Allowance for Loan Losses Allocated | 5,610 | 7,609
Fair value | 17,324 | 25,948
Commercial & Industrial |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 10,792 | 17,098
Allowance for Loan Losses Allocated | 3,353 | 3,153
Fair value | 7,439 | 13,945
Farmland |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 0 | 891
Allowance for Loan Losses Allocated | 0 | 191
Fair value | 0 | 700
Non Farm, Non Residential |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 7,997 | 7,386
Allowance for Loan Losses Allocated | 1,361 | 293
Fair value | 6,636 | 7,093
Agriculture |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 0 | 0
Allowance for Loan Losses Allocated | 0 | 0
Fair value | 0 |
All Other Commercial |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 4,107 | 1,209
Allowance for Loan Losses Allocated | 896 | 52
Fair value | 3,211 | 1,157
First Liens |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 38 | 1,254
Allowance for Loan Losses Allocated | 0 | 126
Fair value | 38 | 1,128
Home Equity |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 0 | 179
Allowance for Loan Losses Allocated | 0 | 0
Fair value | 0 | 179
Junior Liens |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 0 | 0
Allowance for Loan Losses Allocated | 0 | 0
Fair value | 0 | 0
Multifamily |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 0 | 5,540
Allowance for Loan Losses Allocated | 0 | 3,794
Fair value | 0 | 1,746
All Other Residential |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 0 | 0
Allowance for Loan Losses Allocated | 0 |
Fair value | 0 | 0
Motor Vehicle |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 0 | 0
Allowance for Loan Losses Allocated | 0 |
Fair value | 0 | 0
All Other Consumer |  |
Loans identified as impaired by class of loans |  |
Carrying Value | 0 | 0
Allowance for Loan Losses Allocated | 0 |
Fair value | $ 0 | $ 0

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- Definition Represents the estimated fair value of the recorded investments related to impaired financing receivables. + References No definition available. + Details
Name: | thff_ImpairedFinancingReceivableRecordedInvestmentFairValueDisclosure
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Impaired Financing Receivable, Unpaid Principal Balance, Fair Value Disclosure + References No definition available. + Details
Name: | thff_ImpairedFinancingReceivableUnpaidPrincipalBalanceFairValueDisclosure
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FinancingReceivableImpairedLineItems
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=28368275&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant