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OTHER BORROWINGS: (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Other Borrowings Disclosure [Abstract] |  |
FHLB advances | $ 20,796 | $ 0

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | thff_OtherBorrowingsDisclosureAbstract
Namespace Prefix: | thff_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_AdvancesFromFederalHomeLoanBanks
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant