XML 133 R120.htm IDEA: XBRL DOCUMENT
v3.24.0.1

REGULATORY MATTERS - Additional Information (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($)
REGULATORY MATTERS |
Undistributed earnings | $ 38.9

X
- Definition Financial Services, Banking and Thrift + References No definition available. + Details
Name: | thff_FinancialServicesBankingAndThriftAbstract
Namespace Prefix: | thff_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 66 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482689/260-10-45-66 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 60B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482689/260-10-45-60B + Details
Name: | us-gaap_UndistributedEarnings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration