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v2.4.1.9

Fair Value (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2013 | Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Valuation allowance for impaired loans | $ 1,557,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance |  | $ 1,911,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance
Provision for impaired loan losses | (385,000)thff_ProvisionForImpairedLoanLosses | (1,200,000)thff_ProvisionForImpairedLoanLosses |
Other real estate owned | 3,830,000 us-gaap_OtherRealEstate |  | 3,965,000 us-gaap_OtherRealEstate
Commercial Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair Value | 3,600,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |  |
Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair Value | 1,200,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialRealEstateMember |  |
State and Municipal Obligation [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair Value | 4,725,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = thff_StateAndMunicipalObligationMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 5,900,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = thff_StateAndMunicipalObligationMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value Measurements, Valuation Techniques | Discounted cash flow |  | Discounted cash flow
Fair Value Measurements Unobservable Inputs | Discount rate Probability of default |  | Discount rate Probability of default
Impaired Loans | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair Value | 12,787,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = thff_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 11,477,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = thff_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Valuation allowance for impaired loans | 1,600,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FairValueByAssetClassAxis = thff_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 1,900,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FairValueByAssetClassAxis = thff_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value Measurements, Valuation Techniques | Sales comparison/income approach |  | Sales comparison/income approach
Fair Value Measurements Unobservable Inputs | Discount rate for age of appraisal and market conditions |  | Discount rate for age of appraisal and market conditions
Other Real Estate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Real estate, other deductions | 1,100,000 us-gaap_RealEstateOtherDeductions / us-gaap_FairValueByAssetClassAxis = thff_OtherRealEstateMember |  | 1,100,000 us-gaap_RealEstateOtherDeductions / us-gaap_FairValueByAssetClassAxis = thff_OtherRealEstateMember
Other Real Estate | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair Value | 3,830,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = thff_OtherRealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 3,965,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = thff_OtherRealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Other real estate owned | $ 4,800,000 us-gaap_OtherRealEstate / us-gaap_FairValueByAssetClassAxis = thff_OtherRealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Fair Value Measurements, Valuation Techniques | Sales comparison/income approach |  | Sales comparison/income approach
Fair Value Measurements Unobservable Inputs | Discount rate for age of appraisal and market conditions |  | Discount rate for age of appraisal and market conditions
Minimum [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value inputs, discount rate | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | State and Municipal Obligation [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value inputs, discount rate | 3.05%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_StateAndMunicipalObligationMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 3.05%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_StateAndMunicipalObligationMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Impaired Loans | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value inputs, discount rate | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Other Real Estate | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value inputs, discount rate | 5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_OtherRealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_OtherRealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value inputs, discount rate | 50.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maximum [Member] | State and Municipal Obligation [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value inputs, discount rate | 5.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_StateAndMunicipalObligationMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 5.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_StateAndMunicipalObligationMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Impaired Loans | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value inputs, discount rate | 50.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 50.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Other Real Estate | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value inputs, discount rate | 20.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_OtherRealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 20.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = thff_OtherRealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition The description of the unobservable input used to measure the fair value of assets at the end of the period. + References No definition available. + Details
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- Definition Represents the provision for impaired loan losses. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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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=35738203&loc=d3e5212-111524 + Details
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- Definition Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of other deductions to real estate investments, excluding sales, for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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