XML 58 R45.htm IDEA: XBRL DOCUMENT
v3.22.0.1

BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES: (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) branch subsidiary | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Number of investment subsidiaries (subsidiary) | subsidiary | 2 |  |
Transfer to other real estate | $ | $ 43 | $ 567 | $ 458
Repayment of deferred fees and interest in years | 10 years |  |
Expenses for deferred compensation | $ | $ 117 | 111 | 109
Deferred compensation liability, current | $ | $ 1,300 |  |
Incentive award, payment period | 15 years |  |
Compensation liability | $ | $ 6,000 | 6,800 |
Vesting period | 3 years |  |
Officers' compensation expense | $ | $ 2,300 | 2,200 | 1,900
Deferred compensation liablity incentive plan | $ | $ 1,800 | 1,400 |
Likelihood of unfavorable settlement (percent) | 50.00% |  |
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Finite-lived intangible asset, useful life | 10 years |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Finite-lived intangible asset, useful life | 12 years |  |
Furniture and Fixtures | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, estimated useful lives | 3 |  |
Furniture and Fixtures | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, estimated useful lives | 5 |  |
Buildings And Leasehold Improvements | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, estimated useful lives | 33 |  |
Buildings And Leasehold Improvements | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, estimated useful lives | 39 |  |
Daviess County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Greene County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Putnam County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Sullivan County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 3 |  |
Vanderburgh County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Vermillion County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 3 |  |
Clark County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Coles County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 2 |  |
Crawford County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 2 |  |
Franklin County, Illinois [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Jasper County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Lawrence County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Livingston County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 2 |  |
Marion County, Illinois [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 2 |  |
McLean County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 2 |  |
Richland County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Wayne County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
First Financial Bank [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Investments in subsidiaries | $ | $ 910,100 |  |
Service fees |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ | $ 1,300 | $ 1,300 | $ 1,300

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all compensation arrangements payable. Represents currently earned compensation under compensation arrangements that are not actually paid until a later date. + References No definition available. + Details
Name: | thff_CompensationLiability
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the amount of Deferred compensation liability outstanding as of the reporting period. + References No definition available. + Details
Name: | thff_DeferredCompensationLiabilityIncentivePlan
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of expenditure on deferred compensation. + References No definition available. + Details
Name: | thff_ExpensesForDeferredCompensation
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Incentive Award, Payment Period + References No definition available. + Details
Name: | thff_IncentiveAwardPaymentPeriod
Namespace Prefix: | thff_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Income Tax Examination Likelihood Of Unfavorable Settlement, Percent + References No definition available. + Details
Name: | thff_IncomeTaxExaminationLikelihoodOfUnfavorableSettlementPercent
Namespace Prefix: | thff_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Branches Entity Operates + References No definition available. + Details
Name: | thff_NumberofBranchesEntityOperates
Namespace Prefix: | thff_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Investment Subsidiaries + References No definition available. + Details
Name: | thff_NumberofInvestmentSubsidiaries
Namespace Prefix: | thff_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The repayments term of deferred fee. + References No definition available. + Details
Name: | thff_RepaymentOfDeferredFeesAndInterestInYears
Namespace Prefix: | thff_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363 + Details
Name: | us-gaap_DeferredCompensationLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of expense for salary and wage arising from service rendered by officer. Excludes allocated cost, labor-related nonsalary expense, and direct and overhead labor cost included in cost of good and service sold. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_OfficersCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123364984&loc=d3e1205-110223 + Details
Name: | us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value transferred from mortgage loans to real estate owned (REO) in noncash transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 + Details
Name: | us-gaap_TransferToOtherRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_DaviessCountyIndianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_GreeneCountyIndianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_PutnamCountyIndianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_SullivanCountyIndianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_VanderburghCountyIndianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_VermillionCountyIndianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_ClarkCountyIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_ColesCountyIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_CrawfordCountyIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_FranklinCountyIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_JasperCountyIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_LawrenceCountyIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_LivingstonCountyIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_MarionCountyIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_McLeanCountyIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_RichlandCountyIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=thff_WayneCountyIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=thff_FirstFinancialBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=thff_ServicingFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |