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Acquisitions and FDIC Indemnification Asset (Tables) | 6 Months Ended
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Jun. 30, 2016
Business Combinations [Abstract] |
Schedule of carrying amount of covered assets |
|  |  |  |  |  | 2016
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, April 1, |  | $ | 4,036 |  |  | $ | 1,467 |  |  | $ | 5,503 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (124 | ) |  | (11 | ) |  | (135 | )
ASC 310-30 Loans, June 30, |  | $ | 3,912 |  |  | $ | 1,456 |  |  | $ | 5,368 |
|  |  |  |  |  | 2016
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, January 1, |  | $ | 4,122 |  |  | $ | 1,480 |  |  | $ | 5,602 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (210 | ) |  | (24 | ) |  | (234 | )
ASC 310-30 Loans, June 30, |  | $ | 3,912 |  |  | $ | 1,456 |  |  | $ | 5,368 |
|  |  |  |  |  | 2015
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, April 1, |  | $ | 4,701 |  |  | $ | 1,558 |  |  | $ | 6,259 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (372 | ) |  | (11 | ) |  | (383 | )
ASC 310-30 Loans, June 30, |  | $ | 4,329 |  |  | $ | 1,547 |  |  | $ | 5,876 |
|  |  |  |  |  | 2015
(Dollar amounts in thousands) |  | Commercial |  | Consumer |  | Total
Beginning balance, January 1, |  | $ | 4,803 |  |  | $ | 1,571 |  |  | $ | 6,374 |
Discount accretion |  | — |  |  | — |  |  | — |
Disposals |  | (474 | ) |  | (24 | ) |  | (498 | )
ASC 310-30 Loans, June 30, |  | $ | 4,329 |  |  | $ | 1,547 |  |  | $ | 5,876 |

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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