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FAIR VALUES OF FINANCIAL INSTRUMENTS: (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (percent) 0.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (percent) 50.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
State and municipal obligations | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 5,900us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= thff_StateAndMunicipalObligationMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 4,525us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= thff_StateAndMunicipalObligationMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Valuation Technique(s) Discounted cash flow Discounted cash flow
Unobservable Input(s) Discount rate Discount rate
State and municipal obligations | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (percent) 3.05%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_StateAndMunicipalObligationMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 3.05%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_StateAndMunicipalObligationMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
State and municipal obligations | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (percent) 5.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_StateAndMunicipalObligationMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 5.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_StateAndMunicipalObligationMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
State And Municipal Obligations    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (percent) 0.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_StateAndMunicipalObligationsMember		 0.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_StateAndMunicipalObligationsMember
State And Municipal Obligations | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Unobservable Input(s) Probability of default Probability of default
Other Real Estate | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value 3,965us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= thff_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 5,291us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= thff_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Valuation Technique(s) Sales comparison/income approach Sales comparison/income approach
Unobservable Input(s) Discount rate for age of appraisal and market conditions Discount rate for age of appraisal and market conditions
Other Real Estate | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (percent) 5.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_OtherRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 5.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_OtherRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Other Real Estate | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (percent) 20.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_OtherRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 20.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_OtherRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Impaired Loans | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 11,477us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= thff_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 13,765us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= thff_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Valuation Technique(s) Sales comparison/income approach Sales comparison/income approach
Unobservable Input(s) Discount rate for age of appraisal and market conditions Discount rate for age of appraisal and market conditions
Impaired Loans | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (percent) 0.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 0.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Impaired Loans | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (percent) 50.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 50.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= thff_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember