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RESTRICTIONS ON CASH AND DUE FROM BANKS (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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RESTRICTIONS ON CASH AND DUE FROM BANKS |  |
Cash reserve balance | $ 0 | $ 0

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

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- Definition Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 325 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481026/942-325-45-1 + Details
Name: | us-gaap_FederalReserveBankStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant