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OTHER BORROWINGS - Schedule of Other Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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OTHER BORROWINGS |  |
FHLB advances | $ 9,589 | $ 15,937
TOTAL | $ 9,589 | $ 15,937

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Namespace Prefix: | thff_
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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 https://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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Namespace Prefix: | us-gaap_
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- Definition The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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