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ACQUISITIONS AND FDIC INDEMNIFICATION ASSET: (Details 1) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Business Acquisition [Line Items] |  |
Beginning balance | $ 1,530 | $ 1,896
Loans and Leases Receivable, Allowance, Covered | 0 | 0
Disposals | (1,274) | (366)
Total Covered Assets | 7,269 | 1,530
Commercial |  |
Business Acquisition [Line Items] |  |
Beginning balance | 1,530 | 1,896
Loans and Leases Receivable, Allowance, Covered |  | 0
Disposals | (1,274) | (366)
Total Covered Assets | 7,269 | 1,530
Consumer |  |
Business Acquisition [Line Items] |  |
Beginning balance | 0 | 0
Loans and Leases Receivable, Allowance, Covered | 0 | 0
Disposals | 0 | 0
Total Covered Assets | $ 0 | $ 0

X
- Definition Represents the carrying amount of all categories of financing receivables held in portfolio and assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance, whose losses will be shared with the Federal Deposit Insurance Corporation under the loss-sharing agreement. + References No definition available. + Details
Name: | thff_CoveredAssets
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans and Leases Receivable, Disposals + References No definition available. + Details
Name: | thff_LoansandLeasesReceivableDisposals
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 allowance for loan and lease losses covered by loss sharing agreements. + References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowanceCovered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements. + References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |