XML 59 R49.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Acquisitions and FDIC Indemnification Asset (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |
Gain on Sale of certain assets and liabilities of Insurance Brokerage Operation | $ 0 | $ 0 | $ 13,021,000 |  |
Assets |  |  | 2,958,016,000 | $ 2,979,585,000 |
Goodwill |  |  | 34,355,000 | 39,489,000 |
Loans and Leases Receivable, Net of Loans with Deteriorated Credit Quality, Covered |  |  | 6,000,000 | 6,500,000 |
First National Bank Of Danville [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Reimbursements from the FDIC |  |  | 19,400,000 |  |
Business Aquisition, Loss Sharing Agreement Losses On Assets Threshold |  |  | $ 29,000,000 |  |
Business Acquisition Loss Sharing Agreement Losses In Excess Of Threshold To Be Reimbursed Percentage |  |  | 95.00% |  |
Business Acquisition, Loss Sharing Agreement Losses Up To Threshold To Be Reimbursed Percentage |  |  | 80.00% |  |
Forrest Sherer Insurance [Domain] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Assets |  |  |  | 13,000,000 | $ 15,800,000
Insurance Services Revenue |  |  |  | 7,600,000 | 8,300,000
Goodwill | $ 5.1 |  |  |  |
Operating Income (Loss) |  |  |  | $ 168,000 | $ 554,000

X
- Definition Represents the percentage of losses on assets acquired under business combination and covered under loss-sharing agreement, to be reimbursed by FDIC, if losses exceed the threshold amount. + References No definition available. + Details
Name: | thff_BusinessAcquisitionLossSharingAgreementLossesInExcessOfThresholdToBeReimbursedPercentage
Namespace Prefix: | thff_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of losses on assets acquired under business combination and covered under loss-sharing agreement, to be reimbursed by FDIC, if losses are up to the threshold amount. + References No definition available. + Details
Name: | thff_BusinessAcquisitionLossSharingAgreementLossesUpToThresholdToBeReimbursedPercentage
Namespace Prefix: | thff_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the threshold amount of losses on assets acquired in a business combination to calculate the amount of reimbursement under the loss-sharing agreement. + References No definition available. + Details
Name: | thff_BusinessAquisitionLossSharingAgreementLossesOnAssetsThreshold
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gain on Sale of certain Assets and Liabilities of Insurance Brokerage Operation + References No definition available. + Details
Name: | thff_GainonSaleofcertainassetsandliabilitiesofInsuranceBrokerageOperation
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loans and Leases Receivable, Net of Loans with Deteriorated Credit Quality, Covered + References No definition available. + Details
Name: | thff_LoansandLeasesReceivableNetofLoanswithDeterioratedCreditQualityCovered
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of decreases to the indemnification asset due to cash payments received relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=thff_FirstNationalBankOfDanvilleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=thff_ForrestShererInsuranceDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |