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Acquisitions and FDIC Indemnification Asset (Tables) | 6 Months Ended
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Jun. 30, 2018
Business Combinations [Abstract] |
Schedule of carrying amount of covered assets |
|  |  |  |  |  | 2018
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, April 1, |  | $ | 1,860 |  |  | $ | — |  |  | $ | 1,860 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (262 | ) |  | — |  |  | (262 | )
ASC 310-30 Loans, June 30, |  | $ | 1,598 |  |  | $ | — |  |  | $ | 1,598 |
|  |  |  |  |  | 2018
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, January 1, |  | $ | 1,896 |  |  | $ | — |  |  | $ | 1,896 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (298 | ) |  | — |  |  | (298 | )
ASC 310-30 Loans, June 30, |  | $ | 1,598 |  |  | $ | — |  |  | $ | 1,598 |
|  |  |  |  |  | 2017
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, April 1, |  | $ | 2,009 |  |  | $ | — |  |  | $ | 2,009 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (26 | ) |  | — |  |  | (26 | )
ASC 310-30 Loans, June 30, |  | $ | 1,983 |  |  | $ | — |  |  | $ | 1,983 |
|  |  |  |  |  | 2017
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, January 1, |  | $ | 3,451 |  |  | $ | 1,430 |  |  | $ | 4,881 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (1,468 | ) |  | (1,430 | ) |  | (2,898 | )
ASC 310-30 Loans, June 30, |  | $ | 1,983 |  |  | $ | — |  |  | $ | 1,983 |

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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_
Data Type: | nonnum:textBlockItemType
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