<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2020 Workiva-->
<!--r:ba0da479-1f99-4c68-9acf-8c369080b4d3,g:08cc23d8-3021-4be9-a756-1a698e271115-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.first-online.com/role/DocumentAndEntityInformation" xlink:type="simple" xlink:href="thff-20200630.xsd#DocumentAndEntityInformation"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/DocumentAndEntityInformation" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="thff-20200630.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_5b7a95a3-a19a-4911-a128-23be6f7c20b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetReportedAmount"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_4b1f4640-f00e-46c1-867f-0c710ed08290" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableGrossCarryingAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_5b7a95a3-a19a-4911-a128-23be6f7c20b1" xlink:to="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_4b1f4640-f00e-46c1-867f-0c710ed08290" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDeferredIncome_d6b7032a-4dc9-4b00-ae9e-db8e1219f39b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDeferredIncome"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_5b7a95a3-a19a-4911-a128-23be6f7c20b1" xlink:to="loc_us-gaap_LoansAndLeasesReceivableDeferredIncome_d6b7032a-4dc9-4b00-ae9e-db8e1219f39b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableAllowance_65bc2583-df5e-47dd-afa4-73f2dd2e55a2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableAllowance"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_5b7a95a3-a19a-4911-a128-23be6f7c20b1" xlink:to="loc_us-gaap_LoansAndLeasesReceivableAllowance_65bc2583-df5e-47dd-afa4-73f2dd2e55a2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_191a12d8-fe8f-4858-8c28-91867dd8a958" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_19751c11-356f-4d5f-aacb-7d43b3b9ded7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_191a12d8-fe8f-4858-8c28-91867dd8a958" xlink:to="loc_us-gaap_CommonStockValue_19751c11-356f-4d5f-aacb-7d43b3b9ded7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_d21ac0c3-1906-406f-85d0-4094bde18ed6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_191a12d8-fe8f-4858-8c28-91867dd8a958" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_d21ac0c3-1906-406f-85d0-4094bde18ed6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_0defce83-b210-411e-b65e-c67fc03adb14" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_191a12d8-fe8f-4858-8c28-91867dd8a958" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_0defce83-b210-411e-b65e-c67fc03adb14" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_fba8dbcb-0e0d-4d92-b062-55137d0ab43a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_191a12d8-fe8f-4858-8c28-91867dd8a958" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_fba8dbcb-0e0d-4d92-b062-55137d0ab43a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_2d78451c-7631-4d76-809e-ad411277f537" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockValue"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_191a12d8-fe8f-4858-8c28-91867dd8a958" xlink:to="loc_us-gaap_TreasuryStockValue_2d78451c-7631-4d76-809e-ad411277f537" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_ea3793e0-9fcd-4bbf-8790-7073032dabb9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_862ee39a-fff2-4c81-939a-9598d6fd1656" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_ea3793e0-9fcd-4bbf-8790-7073032dabb9" xlink:to="loc_us-gaap_Liabilities_862ee39a-fff2-4c81-939a-9598d6fd1656" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_905dedc7-d3f7-45e8-9ab7-63cf77e75b1c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_ea3793e0-9fcd-4bbf-8790-7073032dabb9" xlink:to="loc_us-gaap_StockholdersEquity_905dedc7-d3f7-45e8-9ab7-63cf77e75b1c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_84e0369c-2c6f-4205-b279-238eb988d600" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Deposits_8d65b048-e6a5-4389-b84c-2f726a2f1e74" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Deposits"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_84e0369c-2c6f-4205-b279-238eb988d600" xlink:to="loc_us-gaap_Deposits_8d65b048-e6a5-4389-b84c-2f726a2f1e74" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase_10012b3e-269c-4caf-8f12-9ea3e8764648" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_84e0369c-2c6f-4205-b279-238eb988d600" xlink:to="loc_us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase_10012b3e-269c-4caf-8f12-9ea3e8764648" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch_5977fdb6-aaa3-4600-8739-61e722a217ac" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_84e0369c-2c6f-4205-b279-238eb988d600" xlink:to="loc_us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch_5977fdb6-aaa3-4600-8739-61e722a217ac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_9a76aed5-6275-4131-8435-736a32a99197" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_84e0369c-2c6f-4205-b279-238eb988d600" xlink:to="loc_us-gaap_OtherLiabilities_9a76aed5-6275-4131-8435-736a32a99197" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_ad4d7da3-571e-4dfb-a0c2-abdaed6ae840" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableGrossCarryingAmount"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesAndLoansReceivableGrossCurrent_27f3d764-feb2-45a4-9045-45156ebd7973" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesAndLoansReceivableGrossCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_ad4d7da3-571e-4dfb-a0c2-abdaed6ae840" xlink:to="loc_us-gaap_NotesAndLoansReceivableGrossCurrent_27f3d764-feb2-45a4-9045-45156ebd7973" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_thff_LoansAndLeasesReceivableResidential_6797bf09-0734-4ba1-9a6c-cf53b2ead476" xlink:href="thff-20200630.xsd#thff_LoansAndLeasesReceivableResidential"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_ad4d7da3-571e-4dfb-a0c2-abdaed6ae840" xlink:to="loc_thff_LoansAndLeasesReceivableResidential_6797bf09-0734-4ba1-9a6c-cf53b2ead476" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_thff_LoansAndLeasesReceivableGrossConsumerExcludingMortgageAndHomeEquity_24a52244-eb01-4269-96e8-c02fc0347923" xlink:href="thff-20200630.xsd#thff_LoansAndLeasesReceivableGrossConsumerExcludingMortgageAndHomeEquity"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_ad4d7da3-571e-4dfb-a0c2-abdaed6ae840" xlink:to="loc_thff_LoansAndLeasesReceivableGrossConsumerExcludingMortgageAndHomeEquity_24a52244-eb01-4269-96e8-c02fc0347923" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Deposits_5b092027-bafb-4550-aa10-83e66ed89d97" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Deposits"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestBearingDepositLiabilities_df90d133-1b3b-41e0-958d-e728c7d63ce9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestBearingDepositLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Deposits_5b092027-bafb-4550-aa10-83e66ed89d97" xlink:to="loc_us-gaap_NoninterestBearingDepositLiabilities_df90d133-1b3b-41e0-958d-e728c7d63ce9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits_25313e6c-4a4d-4a98-91b3-422e1db99a4d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Deposits_5b092027-bafb-4550-aa10-83e66ed89d97" xlink:to="loc_us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits_25313e6c-4a4d-4a98-91b3-422e1db99a4d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestbearingDomesticDepositOther_fbc9c550-7b91-434d-a0bb-a0b52c39d80e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestbearingDomesticDepositOther"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Deposits_5b092027-bafb-4550-aa10-83e66ed89d97" xlink:to="loc_us-gaap_InterestbearingDomesticDepositOther_fbc9c550-7b91-434d-a0bb-a0b52c39d80e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndDueFromBanks_c0f19e25-ac06-435d-914c-7885f9cffb1e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndDueFromBanks"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_CashAndDueFromBanks_c0f19e25-ac06-435d-914c-7885f9cffb1e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsSold_e7d33c70-2690-426a-b7ac-521b3d400fb2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FederalFundsSold"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_FederalFundsSold_e7d33c70-2690-426a-b7ac-521b3d400fb2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecurities_8101eb4e-2ab1-4044-abf5-e8f59de0857b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecurities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_AvailableForSaleSecurities_8101eb4e-2ab1-4044-abf5-e8f59de0857b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_e609ed0b-df3d-4b0d-b936-5fbb29fd7a4c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetReportedAmount"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_e609ed0b-df3d-4b0d-b936-5fbb29fd7a4c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedInvestments_f07b4e5d-8f53-46bb-8c05-c9076e6c7935" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedInvestments"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_RestrictedInvestments_f07b4e5d-8f53-46bb-8c05-c9076e6c7935" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestReceivable_220250bd-aebd-4559-a7b3-24f345146ab3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestReceivable"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_InterestReceivable_220250bd-aebd-4559-a7b3-24f345146ab3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_ebfa1bc2-a442-4830-a13e-9a35c62602b9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_ebfa1bc2-a442-4830-a13e-9a35c62602b9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankOwnedLifeInsurance_07ab4407-9108-4c08-baf6-97e2baeb6ec9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BankOwnedLifeInsurance"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_BankOwnedLifeInsurance_07ab4407-9108-4c08-baf6-97e2baeb6ec9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_9f982490-6d93-4d1e-b584-a94aeea6abc5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_Goodwill_9f982490-6d93-4d1e-b584-a94aeea6abc5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_7dcf9044-7ee1-4a7b-909d-f9a892f0305d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_7dcf9044-7ee1-4a7b-909d-f9a892f0305d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRealEstate_ce37b4a4-b284-4b1c-829a-4addeef42992" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherRealEstate"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_OtherRealEstate_ce37b4a4-b284-4b1c-829a-4addeef42992" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_9f1d7944-293e-4d81-8d03-352d1aa73a63" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssets"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_abec01f6-7cc4-4bd1-b0d1-8381fefba609" xlink:to="loc_us-gaap_OtherAssets_9f1d7944-293e-4d81-8d03-352d1aa73a63" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.first-online.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="simple" xlink:href="thff-20200630.xsd#CONSOLIDATEDBALANCESHEETSParenthetical"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/CONSOLIDATEDSTATEMENTSOFINCOMEANDCOMPREHENSIVEINCOMELOSS" xlink:type="simple" xlink:href="thff-20200630.xsd#CONSOLIDATEDSTATEMENTSOFINCOMEANDCOMPREHENSIVEINCOMELOSS"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/CONSOLIDATEDSTATEMENTSOFINCOMEANDCOMPREHENSIVEINCOMELOSS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_f55a4815-5c45-4123-aede-82ebe7070fa8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_f87b8f5c-f852-46e4-8ce8-cddc286fcf28" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_f55a4815-5c45-4123-aede-82ebe7070fa8" xlink:to="loc_us-gaap_NetIncomeLoss_f87b8f5c-f852-46e4-8ce8-cddc286fcf28" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent_7c534c91-433d-4b91-8442-2d0b44e85f9d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_f55a4815-5c45-4123-aede-82ebe7070fa8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent_7c534c91-433d-4b91-8442-2d0b44e85f9d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_31ffd093-2c76-45ae-b5f4-671b43b992f6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_f55a4815-5c45-4123-aede-82ebe7070fa8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_31ffd093-2c76-45ae-b5f4-671b43b992f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_7bbfc48f-e333-4c41-ba29-2e23b9393f95" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDeposits_d142ecfb-df57-4e97-a0c9-45ffdaa3e2d0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseDeposits"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpense_7bbfc48f-e333-4c41-ba29-2e23b9393f95" xlink:to="loc_us-gaap_InterestExpenseDeposits_d142ecfb-df57-4e97-a0c9-45ffdaa3e2d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseShortTermBorrowings_6a5b24bd-310c-407a-9c74-e38787106c45" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseShortTermBorrowings"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpense_7bbfc48f-e333-4c41-ba29-2e23b9393f95" xlink:to="loc_us-gaap_InterestExpenseShortTermBorrowings_6a5b24bd-310c-407a-9c74-e38787106c45" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOther_30b2b9ef-f86b-4318-87f6-223c4eae9442" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseOther"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpense_7bbfc48f-e333-4c41-ba29-2e23b9393f95" xlink:to="loc_us-gaap_InterestExpenseOther_30b2b9ef-f86b-4318-87f6-223c4eae9442" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_3593a7b7-5329-420e-930f-b21e8b8d14dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_thff_TrustAndFinancialServicesRevenue_e94bf064-6c25-41b2-92d6-8efb7a01f335" xlink:href="thff-20200630.xsd#thff_TrustAndFinancialServicesRevenue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_3593a7b7-5329-420e-930f-b21e8b8d14dc" xlink:to="loc_thff_TrustAndFinancialServicesRevenue_e94bf064-6c25-41b2-92d6-8efb7a01f335" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_thff_ServiceChargesAndFeesOnDepositAccounts_b345bc99-e75c-4bd1-a98f-5e0979991fd7" xlink:href="thff-20200630.xsd#thff_ServiceChargesAndFeesOnDepositAccounts"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_3593a7b7-5329-420e-930f-b21e8b8d14dc" xlink:to="loc_thff_ServiceChargesAndFeesOnDepositAccounts_b345bc99-e75c-4bd1-a98f-5e0979991fd7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_thff_ServiceChargesAndFeesOther_483e4c86-27fd-4adc-ab66-0cbf67900e0e" xlink:href="thff-20200630.xsd#thff_ServiceChargesAndFeesOther"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_3593a7b7-5329-420e-930f-b21e8b8d14dc" xlink:to="loc_thff_ServiceChargesAndFeesOther_483e4c86-27fd-4adc-ab66-0cbf67900e0e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesGainLoss_45bf18c8-d6ab-465a-95a3-f2404df77c7a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtAndEquitySecuritiesGainLoss"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_3593a7b7-5329-420e-930f-b21e8b8d14dc" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesGainLoss_45bf18c8-d6ab-465a-95a3-f2404df77c7a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfMortgageLoans_db35df95-6f65-4f9f-8ce6-b0c9ce072f40" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSaleOfMortgageLoans"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_3593a7b7-5329-420e-930f-b21e8b8d14dc" xlink:to="loc_us-gaap_GainLossOnSaleOfMortgageLoans_db35df95-6f65-4f9f-8ce6-b0c9ce072f40" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_0de1f6d2-abfb-44f8-aa7a-5393e51190a8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncomeOtherOperatingIncome"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_3593a7b7-5329-420e-930f-b21e8b8d14dc" xlink:to="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_0de1f6d2-abfb-44f8-aa7a-5393e51190a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncome_58087838-18ac-4176-9401-d6a9711530a0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherOperatingIncome"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_3593a7b7-5329-420e-930f-b21e8b8d14dc" xlink:to="loc_us-gaap_OtherOperatingIncome_58087838-18ac-4176-9401-d6a9711530a0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceCommissionsAndFees_46ce2ad6-eaff-4b3c-9e1e-45a21e3fdaef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InsuranceCommissionsAndFees"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_3593a7b7-5329-420e-930f-b21e8b8d14dc" xlink:to="loc_us-gaap_InsuranceCommissionsAndFees_46ce2ad6-eaff-4b3c-9e1e-45a21e3fdaef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bbc09c78-44cb-448a-aec9-2c7d223788fa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_7c2867fe-a7bd-4865-814f-d84470083afb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bbc09c78-44cb-448a-aec9-2c7d223788fa" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_7c2867fe-a7bd-4865-814f-d84470083afb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_5573b763-9407-43e9-aa74-d3e6f4cbe59a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncome"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bbc09c78-44cb-448a-aec9-2c7d223788fa" xlink:to="loc_us-gaap_NoninterestIncome_5573b763-9407-43e9-aa74-d3e6f4cbe59a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_34ecbf09-0fe0-4f47-82fb-8bc399d59a47" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bbc09c78-44cb-448a-aec9-2c7d223788fa" xlink:to="loc_us-gaap_NoninterestExpense_34ecbf09-0fe0-4f47-82fb-8bc399d59a47" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_5eb10885-33be-41bd-a5fb-996fe5db7cbd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_66e379ea-c6fc-4ada-828c-c1ed6d3d0213" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeases"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_5eb10885-33be-41bd-a5fb-996fe5db7cbd" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_66e379ea-c6fc-4ada-828c-c1ed6d3d0213" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxable_0a72aa1e-ade0-494d-8f68-48df39387a43" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeSecuritiesTaxable"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_5eb10885-33be-41bd-a5fb-996fe5db7cbd" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxable_0a72aa1e-ade0-494d-8f68-48df39387a43" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxExempt_8fcbd117-d6d6-4e79-b2e4-451ce7f2d891" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeSecuritiesTaxExempt"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_5eb10885-33be-41bd-a5fb-996fe5db7cbd" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxExempt_8fcbd117-d6d6-4e79-b2e4-451ce7f2d891" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInterestAndDividendIncome_974b77dc-09ed-4eaf-9f4d-b63f77811154" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherInterestAndDividendIncome"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_5eb10885-33be-41bd-a5fb-996fe5db7cbd" xlink:to="loc_us-gaap_OtherInterestAndDividendIncome_974b77dc-09ed-4eaf-9f4d-b63f77811154" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_41abc0aa-496e-4b4a-9557-99a7d0c788a5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_184ff99f-b557-4c94-b748-01d4e080db19" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_41abc0aa-496e-4b4a-9557-99a7d0c788a5" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_184ff99f-b557-4c94-b748-01d4e080db19" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanAndLeaseLosses_fdcab116-6cba-49b4-bfb9-fb2d2042c04e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanAndLeaseLosses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_41abc0aa-496e-4b4a-9557-99a7d0c788a5" xlink:to="loc_us-gaap_ProvisionForLoanAndLeaseLosses_fdcab116-6cba-49b4-bfb9-fb2d2042c04e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_961ce987-8c47-4ff1-a167-e8801261c957" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_727bc122-737f-4f95-a8f1-119bafb49a79" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_961ce987-8c47-4ff1-a167-e8801261c957" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_727bc122-737f-4f95-a8f1-119bafb49a79" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_536fb910-5393-4c22-9883-aa54433ee671" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_961ce987-8c47-4ff1-a167-e8801261c957" xlink:to="loc_us-gaap_InterestExpense_536fb910-5393-4c22-9883-aa54433ee671" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_7f468b0f-7d16-477f-874a-f45e785b1974" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyNet_f9758d8b-2899-48da-aa60-d06ad17a838d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OccupancyNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7f468b0f-7d16-477f-874a-f45e785b1974" xlink:to="loc_us-gaap_OccupancyNet_f9758d8b-2899-48da-aa60-d06ad17a838d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentExpense_8979ba0d-c2fc-4f42-aba3-62b7d275dd94" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquipmentExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7f468b0f-7d16-477f-874a-f45e785b1974" xlink:to="loc_us-gaap_EquipmentExpense_8979ba0d-c2fc-4f42-aba3-62b7d275dd94" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_15f0b138-1cc4-4243-bf4d-002ccd588e36" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoninterestExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7f468b0f-7d16-477f-874a-f45e785b1974" xlink:to="loc_us-gaap_OtherNoninterestExpense_15f0b138-1cc4-4243-bf4d-002ccd588e36" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_7eda64ab-3d6e-4522-99f4-2112c343e569" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7f468b0f-7d16-477f-874a-f45e785b1974" xlink:to="loc_us-gaap_LaborAndRelatedExpense_7eda64ab-3d6e-4522-99f4-2112c343e569" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_thff_FederalDepositInsuranceCorporationPremiumExpenseBenefit_5517cca3-255e-447e-b992-af711dee26c7" xlink:href="thff-20200630.xsd#thff_FederalDepositInsuranceCorporationPremiumExpenseBenefit"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7f468b0f-7d16-477f-874a-f45e785b1974" xlink:to="loc_thff_FederalDepositInsuranceCorporationPremiumExpenseBenefit_5517cca3-255e-447e-b992-af711dee26c7" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.first-online.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY" xlink:type="simple" xlink:href="thff-20200630.xsd#CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITYParenthetical" xlink:type="simple" xlink:href="thff-20200630.xsd#CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITYParenthetical"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITYParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="thff-20200630.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_05e9abc6-1313-4d0a-9fc2-213f8a0d41fd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_16c02314-e155-47d6-947b-a76b4e9d1148" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_05e9abc6-1313-4d0a-9fc2-213f8a0d41fd" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_16c02314-e155-47d6-947b-a76b4e9d1148" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_589cb0bb-4e53-4347-92f3-999b769e28e7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_05e9abc6-1313-4d0a-9fc2-213f8a0d41fd" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_589cb0bb-4e53-4347-92f3-999b769e28e7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_90c4f5c9-c5c2-4927-9282-f24ac9bb2baa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_05e9abc6-1313-4d0a-9fc2-213f8a0d41fd" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_90c4f5c9-c5c2-4927-9282-f24ac9bb2baa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cdbf26de-b3a3-4855-ab49-a17c72f9903e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_03463b68-db97-4c35-b8c0-8d2ae569edea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cdbf26de-b3a3-4855-ab49-a17c72f9903e" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_03463b68-db97-4c35-b8c0-8d2ae569edea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_c5dcb4ac-2cb7-40ef-9633-55352a42b411" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cdbf26de-b3a3-4855-ab49-a17c72f9903e" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_c5dcb4ac-2cb7-40ef-9633-55352a42b411" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecurities_e97f054e-7b84-43bf-bbc5-a81ceed6ba19" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecurities"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cdbf26de-b3a3-4855-ab49-a17c72f9903e" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecurities_e97f054e-7b84-43bf-bbc5-a81ceed6ba19" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromLoansAndLeases_3e7e8ca2-e29a-4389-b5d9-bfc1039a06b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForProceedsFromLoansAndLeases"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cdbf26de-b3a3-4855-ab49-a17c72f9903e" xlink:to="loc_us-gaap_PaymentsForProceedsFromLoansAndLeases_3e7e8ca2-e29a-4389-b5d9-bfc1039a06b4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireRestrictedInvestments_30e623ab-0a60-4c40-8663-94f4ab179552" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireRestrictedInvestments"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cdbf26de-b3a3-4855-ab49-a17c72f9903e" xlink:to="loc_us-gaap_PaymentsToAcquireRestrictedInvestments_30e623ab-0a60-4c40-8663-94f4ab179552" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_4346825d-d43f-41e6-b39c-0800ee5e4dad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cdbf26de-b3a3-4855-ab49-a17c72f9903e" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_4346825d-d43f-41e6-b39c-0800ee5e4dad" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfOtherRealEstate_89b8d06a-72f4-4218-9e8e-6b7bcdf10a4e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleOfOtherRealEstate"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cdbf26de-b3a3-4855-ab49-a17c72f9903e" xlink:to="loc_us-gaap_ProceedsFromSaleOfOtherRealEstate_89b8d06a-72f4-4218-9e8e-6b7bcdf10a4e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFederalFundsSold_4fc6bc75-0afb-45eb-a99e-b6c600c5a5ab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInFederalFundsSold"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cdbf26de-b3a3-4855-ab49-a17c72f9903e" xlink:to="loc_us-gaap_IncreaseDecreaseInFederalFundsSold_4fc6bc75-0afb-45eb-a99e-b6c600c5a5ab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_269ec47a-6f92-4449-b08d-d03e7f41024f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cdbf26de-b3a3-4855-ab49-a17c72f9903e" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_269ec47a-6f92-4449-b08d-d03e7f41024f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fa21330-3e62-4c18-bb79-a63e11dc2705" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_1f64f7f6-81ba-4b32-98de-a838c8a3c3d1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fa21330-3e62-4c18-bb79-a63e11dc2705" xlink:to="loc_us-gaap_NetIncomeLoss_1f64f7f6-81ba-4b32-98de-a838c8a3c3d1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_22d15e98-d84f-4be0-898f-1d27f4241443" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AmortizationOfDebtDiscountPremium"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fa21330-3e62-4c18-bb79-a63e11dc2705" xlink:to="loc_us-gaap_AmortizationOfDebtDiscountPremium_22d15e98-d84f-4be0-898f-1d27f4241443" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanAndLeaseLosses_671a0a0a-4a9e-420d-802b-fddfb9d1356b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanAndLeaseLosses"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fa21330-3e62-4c18-bb79-a63e11dc2705" xlink:to="loc_us-gaap_ProvisionForLoanAndLeaseLosses_671a0a0a-4a9e-420d-802b-fddfb9d1356b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesGainLoss_fabcaec1-8e08-45cb-94da-cfadf01c98e1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtAndEquitySecuritiesGainLoss"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fa21330-3e62-4c18-bb79-a63e11dc2705" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesGainLoss_fabcaec1-8e08-45cb-94da-cfadf01c98e1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnSalesOfOtherRealEstate_b8ce2d05-80f7-47c7-a1b8-119d2f5942e4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainsLossesOnSalesOfOtherRealEstate"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fa21330-3e62-4c18-bb79-a63e11dc2705" xlink:to="loc_us-gaap_GainsLossesOnSalesOfOtherRealEstate_b8ce2d05-80f7-47c7-a1b8-119d2f5942e4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_61071e24-b19a-4ab3-9761-1eb50753e446" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherOperatingActivitiesCashFlowStatement"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fa21330-3e62-4c18-bb79-a63e11dc2705" xlink:to="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_61071e24-b19a-4ab3-9761-1eb50753e446" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockExpense_c9c24a6c-22fa-491e-b9f4-d898e8dde34b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockExpense"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fa21330-3e62-4c18-bb79-a63e11dc2705" xlink:to="loc_us-gaap_RestrictedStockExpense_c9c24a6c-22fa-491e-b9f4-d898e8dde34b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_382bfea8-a491-4bc9-95a7-11ff3bc44d50" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fa21330-3e62-4c18-bb79-a63e11dc2705" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_382bfea8-a491-4bc9-95a7-11ff3bc44d50" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_thff_RecoveryofsecurityforpreviouslywrittenoffOTTI_0df1dbe7-06da-4463-bc14-e99b6ee75d09" xlink:href="thff-20200630.xsd#thff_RecoveryofsecurityforpreviouslywrittenoffOTTI"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fa21330-3e62-4c18-bb79-a63e11dc2705" xlink:to="loc_thff_RecoveryofsecurityforpreviouslywrittenoffOTTI_0df1dbe7-06da-4463-bc14-e99b6ee75d09" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.first-online.com/role/SignificantAccountingPolicies" xlink:type="simple" xlink:href="thff-20200630.xsd#SignificantAccountingPolicies"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/SignificantAccountingPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/SignificantAccountingPoliciesDetailsTextual" xlink:type="simple" xlink:href="thff-20200630.xsd#SignificantAccountingPoliciesDetailsTextual"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/SignificantAccountingPoliciesDetailsTextual" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AllowanceforLoanLosses" xlink:type="simple" xlink:href="thff-20200630.xsd#AllowanceforLoanLosses"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AllowanceforLoanLosses" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AllowanceforLoanLossesTables" xlink:type="simple" xlink:href="thff-20200630.xsd#AllowanceforLoanLossesTables"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AllowanceforLoanLossesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AllowanceforLoanLossesDetails" xlink:type="simple" xlink:href="thff-20200630.xsd#AllowanceforLoanLossesDetails"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AllowanceforLoanLossesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AllowanceforLoanLossesDetails1" xlink:type="simple" xlink:href="thff-20200630.xsd#AllowanceforLoanLossesDetails1"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AllowanceforLoanLossesDetails1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_thff_FinancingReceivableRecordedInvestment_15cc7bf5-b02f-42f4-a4c4-a02609fad51f" xlink:href="thff-20200630.xsd#thff_FinancingReceivableRecordedInvestment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_5a527cb7-6645-47ab-b3fd-9a251d6e0ed4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_FinancingReceivableRecordedInvestment_15cc7bf5-b02f-42f4-a4c4-a02609fad51f" xlink:to="loc_us-gaap_NotesReceivableNet_5a527cb7-6645-47ab-b3fd-9a251d6e0ed4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableAllowance_efb95f86-8064-46dd-bdec-8fd5781e2ccc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableAllowance"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_a5339af8-ddde-40f2-9731-d728b99b5299" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableAllowance_efb95f86-8064-46dd-bdec-8fd5781e2ccc" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_a5339af8-ddde-40f2-9731-d728b99b5299" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.first-online.com/role/AllowanceforLoanLossesDetails2" xlink:type="simple" xlink:href="thff-20200630.xsd#AllowanceforLoanLossesDetails2"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AllowanceforLoanLossesDetails2" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AllowanceforLoanLossesDetails3" xlink:type="simple" xlink:href="thff-20200630.xsd#AllowanceforLoanLossesDetails3"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AllowanceforLoanLossesDetails3" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AllowanceforLoanLossesDetails4" xlink:type="simple" xlink:href="thff-20200630.xsd#AllowanceforLoanLossesDetails4"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AllowanceforLoanLossesDetails4" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AllowanceforLoanLossesDetails5" xlink:type="simple" xlink:href="thff-20200630.xsd#AllowanceforLoanLossesDetails5"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AllowanceforLoanLossesDetails5" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_thff_FinancingReceivableRecordedInvestment_6c6c36d8-a797-4104-ae80-b10aa3fae201" xlink:href="thff-20200630.xsd#thff_FinancingReceivableRecordedInvestment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDue_fcefd869-6ab9-42dc-a3d2-320637e3781f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_FinancingReceivableRecordedInvestment_6c6c36d8-a797-4104-ae80-b10aa3fae201" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDue_fcefd869-6ab9-42dc-a3d2-320637e3781f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentCurrent_acf5d1ab-57f5-475c-b64b-13cfb1fc14cf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_FinancingReceivableRecordedInvestment_6c6c36d8-a797-4104-ae80-b10aa3fae201" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentCurrent_acf5d1ab-57f5-475c-b64b-13cfb1fc14cf" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.first-online.com/role/AllowanceforLoanLossesDetails6" xlink:type="simple" xlink:href="thff-20200630.xsd#AllowanceforLoanLossesDetails6"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AllowanceforLoanLossesDetails6" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AllowanceforLoanLossesDetailsTextual" xlink:type="simple" xlink:href="thff-20200630.xsd#AllowanceforLoanLossesDetailsTextual"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AllowanceforLoanLossesDetailsTextual" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/Securities" xlink:type="simple" xlink:href="thff-20200630.xsd#Securities"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/Securities" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/SecuritiesTables" xlink:type="simple" xlink:href="thff-20200630.xsd#SecuritiesTables"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/SecuritiesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/SecuritiesDetails" xlink:type="simple" xlink:href="thff-20200630.xsd#SecuritiesDetails"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/SecuritiesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/SecuritiesDetails1" xlink:type="simple" xlink:href="thff-20200630.xsd#SecuritiesDetails1"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/SecuritiesDetails1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateAmortizedCost_2fb9316f-bbca-4aa7-9927-8a943abf6b5d" xlink:href="thff-20200630.xsd#thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateAmortizedCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_fffa6006-5dbe-4656-a0be-ce9b185aa5d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateAmortizedCost_2fb9316f-bbca-4aa7-9927-8a943abf6b5d" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_fffa6006-5dbe-4656-a0be-ce9b185aa5d2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_74a7f02b-13df-449e-b8ed-12e7de3e3c23" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateAmortizedCost_2fb9316f-bbca-4aa7-9927-8a943abf6b5d" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_74a7f02b-13df-449e-b8ed-12e7de3e3c23" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_0f5d748b-49b2-4d94-aff5-7e86df81eb63" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateAmortizedCost_2fb9316f-bbca-4aa7-9927-8a943abf6b5d" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_0f5d748b-49b2-4d94-aff5-7e86df81eb63" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_51626990-72f4-458c-b0e8-29e1ba9ef8c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateAmortizedCost_2fb9316f-bbca-4aa7-9927-8a943abf6b5d" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_51626990-72f4-458c-b0e8-29e1ba9ef8c1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateFairValue_d8f47d40-d8dd-4192-9c1e-b4408b5795da" xlink:href="thff-20200630.xsd#thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_c80e56bb-5156-4266-b6dc-5921d47cfe52" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateFairValue_d8f47d40-d8dd-4192-9c1e-b4408b5795da" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_c80e56bb-5156-4266-b6dc-5921d47cfe52" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_307cbeb8-d6e5-4620-a62b-2976447c850e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateFairValue_d8f47d40-d8dd-4192-9c1e-b4408b5795da" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_307cbeb8-d6e5-4620-a62b-2976447c850e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_8bb7d904-1b6c-431b-9125-529e8f266545" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateFairValue_d8f47d40-d8dd-4192-9c1e-b4408b5795da" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_8bb7d904-1b6c-431b-9125-529e8f266545" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_5b62028e-36db-4a71-a145-84150eafba5b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateFairValue_d8f47d40-d8dd-4192-9c1e-b4408b5795da" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_5b62028e-36db-4a71-a145-84150eafba5b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_fbabbd5d-5f28-4426-adca-9457174cb052" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAmortizedCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateAmortizedCost_6f4cb31c-7eec-4188-9c2c-e3b3177d7653" xlink:href="thff-20200630.xsd#thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateAmortizedCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_fbabbd5d-5f28-4426-adca-9457174cb052" xlink:to="loc_thff_AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateAmortizedCost_6f4cb31c-7eec-4188-9c2c-e3b3177d7653" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_70b71710-3fb1-486d-86b4-0ae5a38d0128" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_fbabbd5d-5f28-4426-adca-9457174cb052" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_70b71710-3fb1-486d-86b4-0ae5a38d0128" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.first-online.com/role/SecuritiesDetails2" xlink:type="simple" xlink:href="thff-20200630.xsd#SecuritiesDetails2"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/SecuritiesDetails2" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue_dc99f14e-dbb9-4850-ba5c-1ce695045307" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_55e9591d-2239-4a68-b090-62c10de06324" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue_dc99f14e-dbb9-4850-ba5c-1ce695045307" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_55e9591d-2239-4a68-b090-62c10de06324" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_41ffc60d-b335-4a6c-b3c5-487b2e5b8167" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue_dc99f14e-dbb9-4850-ba5c-1ce695045307" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_41ffc60d-b335-4a6c-b3c5-487b2e5b8167" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_e32b4c55-55b1-4a06-a9f9-6377423194e7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_4a4ef650-e23a-4f86-b53b-609e22c5a2a1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_e32b4c55-55b1-4a06-a9f9-6377423194e7" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_4a4ef650-e23a-4f86-b53b-609e22c5a2a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_ffde821b-6fc4-4c11-858c-0bd0b6b7091b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_e32b4c55-55b1-4a06-a9f9-6377423194e7" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_ffde821b-6fc4-4c11-858c-0bd0b6b7091b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.first-online.com/role/SecuritiesDetails2_1" xlink:type="simple" xlink:href="thff-20200630.xsd#SecuritiesDetails2_1"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/SecuritiesDetails2_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_10c7aec2-b93c-438a-9ff7-6a245bd03b9e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_c227918c-ffaf-460f-9ae6-0903b1ee75f1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_10c7aec2-b93c-438a-9ff7-6a245bd03b9e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_c227918c-ffaf-460f-9ae6-0903b1ee75f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_e40a4ed1-9515-4f85-8cbb-f5c5afe37c62" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_10c7aec2-b93c-438a-9ff7-6a245bd03b9e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_e40a4ed1-9515-4f85-8cbb-f5c5afe37c62" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.first-online.com/role/SecuritiesDetails3" xlink:type="simple" xlink:href="thff-20200630.xsd#SecuritiesDetails3"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/SecuritiesDetails3" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/SecuritiesDetailsTextual" xlink:type="simple" xlink:href="thff-20200630.xsd#SecuritiesDetailsTextual"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/SecuritiesDetailsTextual" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/FairValue" xlink:type="simple" xlink:href="thff-20200630.xsd#FairValue"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/FairValue" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/FairValueTables" xlink:type="simple" xlink:href="thff-20200630.xsd#FairValueTables"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/FairValueTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/FairValueDetails" xlink:type="simple" xlink:href="thff-20200630.xsd#FairValueDetails"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/FairValueDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/FairValueDetails1" xlink:type="simple" xlink:href="thff-20200630.xsd#FairValueDetails1"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/FairValueDetails1" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/FairValueDetails2" xlink:type="simple" xlink:href="thff-20200630.xsd#FairValueDetails2"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/FairValueDetails2" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/FairValueDetails3" xlink:type="simple" xlink:href="thff-20200630.xsd#FairValueDetails3"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/FairValueDetails3" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/FairValueDetails4" xlink:type="simple" xlink:href="thff-20200630.xsd#FairValueDetails4"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/FairValueDetails4" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/FairValueDetailsTextual" xlink:type="simple" xlink:href="thff-20200630.xsd#FairValueDetailsTextual"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/FairValueDetailsTextual" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/ShortTermBorrowings" xlink:type="simple" xlink:href="thff-20200630.xsd#ShortTermBorrowings"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/ShortTermBorrowings" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/ShortTermBorrowingsTables" xlink:type="simple" xlink:href="thff-20200630.xsd#ShortTermBorrowingsTables"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/ShortTermBorrowingsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/ShortTermBorrowingsDetails" xlink:type="simple" xlink:href="thff-20200630.xsd#ShortTermBorrowingsDetails"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/ShortTermBorrowingsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_thff_FederalFundsPurchasedRepurchaseAgreementsNotesPayable_1be6a114-bd61-41ae-9ba4-3b6493718e87" xlink:href="thff-20200630.xsd#thff_FederalFundsPurchasedRepurchaseAgreementsNotesPayable"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsPurchased_61d01f17-e2c2-402a-b552-d24f8c3f4eff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FederalFundsPurchased"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_FederalFundsPurchasedRepurchaseAgreementsNotesPayable_1be6a114-bd61-41ae-9ba4-3b6493718e87" xlink:to="loc_us-gaap_FederalFundsPurchased_61d01f17-e2c2-402a-b552-d24f8c3f4eff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_b42d553d-e7e6-4d93-9a8a-44d219bdce41" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchase"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_thff_FederalFundsPurchasedRepurchaseAgreementsNotesPayable_1be6a114-bd61-41ae-9ba4-3b6493718e87" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_b42d553d-e7e6-4d93-9a8a-44d219bdce41" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.first-online.com/role/ShortTermBorrowingsShortTermBorrowingsDetails1" xlink:type="simple" xlink:href="thff-20200630.xsd#ShortTermBorrowingsShortTermBorrowingsDetails1"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/ShortTermBorrowingsShortTermBorrowingsDetails1" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/ComponentsofNetPeriodicBenefitCost" xlink:type="simple" xlink:href="thff-20200630.xsd#ComponentsofNetPeriodicBenefitCost"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/ComponentsofNetPeriodicBenefitCost" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/ComponentsofNetPeriodicBenefitCostTables" xlink:type="simple" xlink:href="thff-20200630.xsd#ComponentsofNetPeriodicBenefitCostTables"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/ComponentsofNetPeriodicBenefitCostTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/ComponentsofNetPeriodicBenefitCostDetails" xlink:type="simple" xlink:href="thff-20200630.xsd#ComponentsofNetPeriodicBenefitCostDetails"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/ComponentsofNetPeriodicBenefitCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_492ce4b9-14e3-4955-b987-c91441eddfcd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_77bb9cfb-9204-44bb-a7a4-48858764c4b0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_492ce4b9-14e3-4955-b987-c91441eddfcd" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_77bb9cfb-9204-44bb-a7a4-48858764c4b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_f800ce37-5c1e-44ed-b26f-f9c6ffad7c75" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_492ce4b9-14e3-4955-b987-c91441eddfcd" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_f800ce37-5c1e-44ed-b26f-f9c6ffad7c75" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_34fef2c9-03df-4aed-a6c1-672e4e8507b2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_492ce4b9-14e3-4955-b987-c91441eddfcd" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_34fef2c9-03df-4aed-a6c1-672e4e8507b2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_16ed6553-1714-41af-96c6-3e9060bd5dbd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_492ce4b9-14e3-4955-b987-c91441eddfcd" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_16ed6553-1714-41af-96c6-3e9060bd5dbd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_484d5046-a3d3-4c3a-8549-94b5eaec1f88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_492ce4b9-14e3-4955-b987-c91441eddfcd" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_484d5046-a3d3-4c3a-8549-94b5eaec1f88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfTransitionAssetObligation_ae4d4e2f-f6ce-4a5b-a867-c349160fb605" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfTransitionAssetObligation"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_492ce4b9-14e3-4955-b987-c91441eddfcd" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfTransitionAssetObligation_ae4d4e2f-f6ce-4a5b-a867-c349160fb605" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.first-online.com/role/ComponentsofNetPeriodicBenefitCostDetailsTextual" xlink:type="simple" xlink:href="thff-20200630.xsd#ComponentsofNetPeriodicBenefitCostDetailsTextual"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/ComponentsofNetPeriodicBenefitCostDetailsTextual" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/Newaccountingstandards" xlink:type="simple" xlink:href="thff-20200630.xsd#Newaccountingstandards"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/Newaccountingstandards" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AcquisitionsandFDICIndemnificationAsset" xlink:type="simple" xlink:href="thff-20200630.xsd#AcquisitionsandFDICIndemnificationAsset"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AcquisitionsandFDICIndemnificationAsset" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AcquisitionsandFDICIndemnificationAssetTables" xlink:type="simple" xlink:href="thff-20200630.xsd#AcquisitionsandFDICIndemnificationAssetTables"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AcquisitionsandFDICIndemnificationAssetTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AcquisitionsandFDICIndemnificationAssetDetails" xlink:type="simple" xlink:href="thff-20200630.xsd#AcquisitionsandFDICIndemnificationAssetDetails"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AcquisitionsandFDICIndemnificationAssetDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AcquisitionsandFDICIndemnificationAssetDetails1" xlink:type="simple" xlink:href="thff-20200630.xsd#AcquisitionsandFDICIndemnificationAssetDetails1"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AcquisitionsandFDICIndemnificationAssetDetails1" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AcquisitionsandFDICIndemnificationAssetDetailsTextual" xlink:type="simple" xlink:href="thff-20200630.xsd#AcquisitionsandFDICIndemnificationAssetDetailsTextual"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AcquisitionsandFDICIndemnificationAssetDetailsTextual" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AccumulatedOtherComprehensiveIncome" xlink:type="simple" xlink:href="thff-20200630.xsd#AccumulatedOtherComprehensiveIncome"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AccumulatedOtherComprehensiveIncome" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AccumulatedOtherComprehensiveIncomeTables" xlink:type="simple" xlink:href="thff-20200630.xsd#AccumulatedOtherComprehensiveIncomeTables"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AccumulatedOtherComprehensiveIncomeTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="thff-20200630.xsd#AccumulatedOtherComprehensiveIncomeDetails"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_eef5a7b0-572c-4eab-bd92-eac0c94eefe0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_49f3cbdd-e220-423f-8716-d2df305c8311" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_eef5a7b0-572c-4eab-bd92-eac0c94eefe0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_49f3cbdd-e220-423f-8716-d2df305c8311" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_649f0b3d-d089-46fb-9032-a4676deda700" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_eef5a7b0-572c-4eab-bd92-eac0c94eefe0" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_649f0b3d-d089-46fb-9032-a4676deda700" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.first-online.com/role/AccumulatedOtherComprehensiveIncomeDetails1" xlink:type="simple" xlink:href="thff-20200630.xsd#AccumulatedOtherComprehensiveIncomeDetails1"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AccumulatedOtherComprehensiveIncomeDetails1" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.first-online.com/role/AccumulatedOtherComprehensiveIncomeDetails2" xlink:type="simple" xlink:href="thff-20200630.xsd#AccumulatedOtherComprehensiveIncomeDetails2"/>
  <link:calculationLink xlink:role="http://www.first-online.com/role/AccumulatedOtherComprehensiveIncomeDetails2" xlink:type="extended"/>
</link:linkbase>
