Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000714562-22-000029-index-headers.html | 2022-03-09 13:50:11 | |
| 0000714562-22-000029-index.html | 2022-03-09 13:50:11 | |
| 0000714562-22-000029.txt | 2022-03-09 13:50:11 | |
 0000714562-22-000029-xbrl.zip | 709151 | 2022-03-09 13:50:11 |
| FilingSummary.xml | 68229 | 2022-03-09 13:50:11 |
| Financial_Report.xlsx | 190916 | 2022-03-09 13:50:11 |
| MetaLinks.json | 1196665 | 2022-03-09 13:50:11 |
| R1.htm | 63108 | 2022-03-09 13:50:11 |
| R10.htm | 173925 | 2022-03-09 13:50:11 |
| R100.htm | 59189 | 2022-03-09 13:50:11 |
| R101.htm | 38054 | 2022-03-09 13:50:11 |
| R102.htm | 25043 | 2022-03-09 13:50:11 |
| R103.htm | 27556 | 2022-03-09 13:50:11 |
| R104.htm | 22647 | 2022-03-09 13:50:11 |
| R105.htm | 34037 | 2022-03-09 13:50:11 |
| R106.htm | 4837 | 2022-03-09 13:50:11 |
| R107.htm | 63306 | 2022-03-09 13:50:11 |
| R108.htm | 50345 | 2022-03-09 13:50:11 |
| R109.htm | 39796 | 2022-03-09 13:50:11 |
| R11.htm | 4969 | 2022-03-09 13:50:11 |
| R110.htm | 63587 | 2022-03-09 13:50:11 |
| R12.htm | 150225 | 2022-03-09 13:50:11 |
| R13.htm | 29582 | 2022-03-09 13:50:11 |
| R14.htm | 34038 | 2022-03-09 13:50:11 |
| R15.htm | 964021 | 2022-03-09 13:50:11 |
| R16.htm | 21031 | 2022-03-09 13:50:11 |
| R17.htm | 32278 | 2022-03-09 13:50:11 |
| R18.htm | 9551 | 2022-03-09 13:50:11 |
| R19.htm | 34710 | 2022-03-09 13:50:11 |
| R2.htm | 7858 | 2022-03-09 13:50:11 |
| R20.htm | 17018 | 2022-03-09 13:50:11 |
| R21.htm | 82435 | 2022-03-09 13:50:11 |
| R22.htm | 16898 | 2022-03-09 13:50:11 |
| R23.htm | 181294 | 2022-03-09 13:50:11 |
| R24.htm | 22455 | 2022-03-09 13:50:11 |
| R25.htm | 104817 | 2022-03-09 13:50:11 |
| R26.htm | 76353 | 2022-03-09 13:50:11 |
| R27.htm | 90632 | 2022-03-09 13:50:11 |
| R28.htm | 106770 | 2022-03-09 13:50:11 |
| R29.htm | 171074 | 2022-03-09 13:50:11 |
| R3.htm | 90711 | 2022-03-09 13:50:11 |
| R30.htm | 150862 | 2022-03-09 13:50:11 |
| R31.htm | 27754 | 2022-03-09 13:50:11 |
| R32.htm | 895606 | 2022-03-09 13:50:11 |
| R33.htm | 21486 | 2022-03-09 13:50:11 |
| R34.htm | 24341 | 2022-03-09 13:50:11 |
| R35.htm | 8035 | 2022-03-09 13:50:11 |
| R36.htm | 17944 | 2022-03-09 13:50:11 |
| R37.htm | 17211 | 2022-03-09 13:50:11 |
| R38.htm | 85057 | 2022-03-09 13:50:11 |
| R39.htm | 12164 | 2022-03-09 13:50:11 |
| R4.htm | 16127 | 2022-03-09 13:50:11 |
| R40.htm | 185496 | 2022-03-09 13:50:11 |
| R41.htm | 18739 | 2022-03-09 13:50:11 |
| R42.htm | 105923 | 2022-03-09 13:50:11 |
| R43.htm | 70450 | 2022-03-09 13:50:11 |
| R44.htm | 92441 | 2022-03-09 13:50:11 |
| R45.htm | 87389 | 2022-03-09 13:50:11 |
| R46.htm | 48927 | 2022-03-09 13:50:11 |
| R47.htm | 24942 | 2022-03-09 13:50:11 |
| R48.htm | 33152 | 2022-03-09 13:50:11 |
| R49.htm | 39118 | 2022-03-09 13:50:11 |
| R5.htm | 103204 | 2022-03-09 13:50:11 |
| R50.htm | 27698 | 2022-03-09 13:50:11 |
| R51.htm | 4675 | 2022-03-09 13:50:11 |
| R52.htm | 40696 | 2022-03-09 13:50:11 |
| R53.htm | 8754 | 2022-03-09 13:50:11 |
| R54.htm | 39365 | 2022-03-09 13:50:11 |
| R55.htm | 55168 | 2022-03-09 13:50:11 |
| R56.htm | 8246 | 2022-03-09 13:50:11 |
| R57.htm | 28361 | 2022-03-09 13:50:11 |
| R58.htm | 20820 | 2022-03-09 13:50:11 |
| R59.htm | 31518 | 2022-03-09 13:50:11 |
| R6.htm | 41756 | 2022-03-09 13:50:11 |
| R60.htm | 10092 | 2022-03-09 13:50:11 |
| R61.htm | 28686 | 2022-03-09 13:50:11 |
| R62.htm | 39347 | 2022-03-09 13:50:11 |
| R63.htm | 48903 | 2022-03-09 13:50:11 |
| R64.htm | 22581 | 2022-03-09 13:50:11 |
| R65.htm | 124495 | 2022-03-09 13:50:11 |
| R66.htm | 212291 | 2022-03-09 13:50:11 |
| R67.htm | 11665 | 2022-03-09 13:50:11 |
| R68.htm | 17420 | 2022-03-09 13:50:11 |
| R69.htm | 6818 | 2022-03-09 13:50:11 |
| R7.htm | 6687 | 2022-03-09 13:50:11 |
| R70.htm | 16770 | 2022-03-09 13:50:11 |
| R71.htm | 5518 | 2022-03-09 13:50:11 |
| R72.htm | 9428 | 2022-03-09 13:50:11 |
| R73.htm | 13295 | 2022-03-09 13:50:11 |
| R74.htm | 12489 | 2022-03-09 13:50:11 |
| R75.htm | 9890 | 2022-03-09 13:50:11 |
| R76.htm | 23951 | 2022-03-09 13:50:11 |
| R77.htm | 4586 | 2022-03-09 13:50:11 |
| R78.htm | 22930 | 2022-03-09 13:50:11 |
| R79.htm | 15550 | 2022-03-09 13:50:11 |
| R8.htm | 108986 | 2022-03-09 13:50:11 |
| R80.htm | 23773 | 2022-03-09 13:50:11 |
| R81.htm | 21296 | 2022-03-09 13:50:11 |
| R82.htm | 49750 | 2022-03-09 13:50:11 |
| R83.htm | 11945 | 2022-03-09 13:50:11 |
| R84.htm | 11831 | 2022-03-09 13:50:11 |
| R85.htm | 21529 | 2022-03-09 13:50:11 |
| R86.htm | 7179 | 2022-03-09 13:50:11 |
| R87.htm | 30293 | 2022-03-09 13:50:11 |
| R88.htm | 35455 | 2022-03-09 13:50:11 |
| R89.htm | 10707 | 2022-03-09 13:50:11 |
| R9.htm | 60727 | 2022-03-09 13:50:11 |
| R90.htm | 15448 | 2022-03-09 13:50:11 |
| R91.htm | 27005 | 2022-03-09 13:50:11 |
| R92.htm | 31493 | 2022-03-09 13:50:11 |
| R93.htm | 14184 | 2022-03-09 13:50:11 |
| R94.htm | 18017 | 2022-03-09 13:50:11 |
| R95.htm | 18241 | 2022-03-09 13:50:11 |
| R96.htm | 25799 | 2022-03-09 13:50:11 |
| R97.htm | 10613 | 2022-03-09 13:50:11 |
| R98.htm | 33322 | 2022-03-09 13:50:11 |
| R99.htm | 18210 | 2022-03-09 13:50:11 |
| R9999.htm | 4028 | 2022-03-09 13:50:11 |
| report.css | 2768 | 2022-03-09 13:50:11 |
| Show.js | 1086 | 2022-03-09 13:50:11 |
| thff-20211231.htm | 5116516 | 2022-03-09 13:50:11 |
| thff-20211231.xsd | 94292 | 2022-03-09 13:50:11 |
| thff-20211231x10kexx1016.htm | 64860 | 2022-03-09 13:50:11 |
| thff-20211231x10kexx21.htm | 2257 | 2022-03-09 13:50:11 |
| thff-20211231x10kexx311.htm | 10807 | 2022-03-09 13:50:11 |
| thff-20211231x10kexx312.htm | 10837 | 2022-03-09 13:50:11 |
| thff-20211231x10kexx321.htm | 5024 | 2022-03-09 13:50:11 |
| thff-20211231x10kexx322.htm | 4915 | 2022-03-09 13:50:11 |
| thff-20211231_cal.xml | 149700 | 2022-03-09 13:50:11 |
| thff-20211231_def.xml | 530326 | 2022-03-09 13:50:11 |
 thff-20211231_g1.jpg | 128525 | 2022-03-09 13:50:11 |
| thff-20211231_htm.xml | 5956342 | 2022-03-09 13:50:11 |
| thff-20211231_lab.xml | 1233778 | 2022-03-09 13:50:11 |
| thff-20211231_pre.xml | 883645 | 2022-03-09 13:50:11 |