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Acquisitions and FDIC Indemnification Asset (Tables) | 9 Months Ended
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Sep. 30, 2018
Business Combinations [Abstract] |
Schedule of carrying amount of covered assets |
|  |  |  |  |  | 2018
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, July 1, |  | $ | 1,598 |  |  | $ | — |  |  | $ | 1,598 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (16 | ) |  | — |  |  | (16 | )
ASC 310-30 Loans, September 30, |  | $ | 1,582 |  |  | $ | — |  |  | $ | 1,582 |
|  |  |  |  |  | 2018
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, January 1, |  | $ | 1,896 |  |  | $ | — |  |  | $ | 1,896 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (314 | ) |  | — |  |  | (314 | )
ASC 310-30 Loans, September 30, |  | $ | 1,582 |  |  | $ | — |  |  | $ | 1,582 |
|  |  |  |  |  | 2017
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, July 1, |  | $ | 1,983 |  |  | $ | — |  |  | $ | 1,983 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (47 | ) |  | — |  |  | (47 | )
ASC 310-30 Loans, September 30, |  | $ | 1,936 |  |  | $ | — |  |  | $ | 1,936 |
|  |  |  |  |  | 2017
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, January 1, |  | $ | 3,451 |  |  | $ | 1,430 |  |  | $ | 4,881 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (1,515 | ) |  | (1,430 | ) |  | (2,945 | )
ASC 310-30 Loans, September 30, |  | $ | 1,936 |  |  | $ | — |  |  | $ | 1,936 |

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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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Balance Type: | na
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