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Components of Net Periodic Benefit Cost (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 538 us-gaap_DefinedBenefitPlanServiceCost / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember | $ 510 us-gaap_DefinedBenefitPlanServiceCost / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember
Interest cost | 879 us-gaap_DefinedBenefitPlanInterestCost / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember | 939 us-gaap_DefinedBenefitPlanInterestCost / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember
Expected return on plan assets | (863)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember | (948)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember
Amortization of transition obligation | 0 us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember | 0 us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember
Net amortization of prior service cost | 0 us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember | (2)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember
Net amortization of net (gain) loss | 1,185 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember | 190 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember
Net Periodic Benefit Cost | 1,739 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember | 689 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_RegulatoryLiabilityAxis = thff_PensionBenefitsMember
Post-Retirement Health Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 16 us-gaap_DefinedBenefitPlanServiceCost / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember | 13 us-gaap_DefinedBenefitPlanServiceCost / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember
Interest cost | 43 us-gaap_DefinedBenefitPlanInterestCost / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember | 44 us-gaap_DefinedBenefitPlanInterestCost / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember
Expected return on plan assets | 0 us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember | 0 us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember
Amortization of transition obligation | 0 us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember | 0 us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember
Net amortization of prior service cost | 0 us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember | 0 us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember
Net amortization of net (gain) loss | 0 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember | 0 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember
Net Periodic Benefit Cost | $ 59 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember | $ 57 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_RegulatoryLiabilityAxis = thff_PostRetirementHealthBenefitsMember

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- Definition The amount of gains or losses recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of the transition obligation or asset recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(6) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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