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v3.19.1

Acquisitions and FDIC Indemnification Asset (Tables) | 3 Months Ended
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Mar. 31, 2019
Business Combinations [Abstract] |
Schedule of carrying amount of covered assets |
|  |  |  |  |  | 2019
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, January 1, |  | $ | 1,530 |  |  | $ | — |  |  | $ | 1,530 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (36 | ) |  | — |  |  | (36 | )
ASC 310-30 Loans, March 31, |  | $ | 1,494 |  |  | $ | — |  |  | $ | 1,494 |
|  |  |  |  |  | 2018
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, January 1, |  | $ | 1,896 |  |  | $ | — |  |  | $ | 1,896 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (36 | ) |  | — |  |  | (36 | )
ASC 310-30 Loans, March 31, |  | $ | 1,860 |  |  | $ | — |  |  | $ | 1,860 |

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- Definition Tabular disclosure of assets acquired in a business combination subject to loss sharing agreement, by credit deterioration. + References No definition available. + Details
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Namespace Prefix: | thff_
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Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_BusinessCombinationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration