XML 65 R52.htm IDEA: XBRL DOCUMENT
v3.20.4

FAIR VALUES OF FINANCIAL INSTRUMENTS: (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Carrying amount and estimated fair value of financial instruments |  |
Gain On Sale Of Securities Net | $ 290 | $ 55
Valuation allowance for impaired loans |  | 48
Other Real Estate Commercial loan | Level 3 |  |
Carrying amount and estimated fair value of financial instruments |  |
Fair Value | 846 | 3,500
Other Real Estate Residential Loan | Level 3 |  |
Carrying amount and estimated fair value of financial instruments |  |
Fair Value | 167 | 142
Impaired Loans | Level 3 |  |
Carrying amount and estimated fair value of financial instruments |  |
Fair Value | 6,581 | 100
Other Real Estate | Level 3 |  |
Carrying amount and estimated fair value of financial instruments |  |
Fair Value | 1,012 | 3,625
Assets fair value adjustment increase (decrease) | $ 0 | $ (64)
Measurement Input, Discount Rate [Member] | Minimum |  |
Carrying amount and estimated fair value of financial instruments |  |
Fair Value Inputs, Discount Rate | 0 |
Measurement Input, Discount Rate [Member] | Minimum | Impaired Loans |  |
Carrying amount and estimated fair value of financial instruments |  |
Fair Value Inputs, Discount Rate | 0.0000 | 0.0000
Measurement Input, Discount Rate [Member] | Minimum | Other Real Estate |  |
Carrying amount and estimated fair value of financial instruments |  |
Fair Value Inputs, Discount Rate | 0.0500 | 0.0500
Measurement Input, Discount Rate [Member] | Maximum |  |
Carrying amount and estimated fair value of financial instruments |  |
Fair Value Inputs, Discount Rate | 0.50 |
Measurement Input, Discount Rate [Member] | Maximum | Impaired Loans |  |
Carrying amount and estimated fair value of financial instruments |  |
Fair Value Inputs, Discount Rate | 0.5000 | 0.5000
Measurement Input, Discount Rate [Member] | Maximum | Other Real Estate |  |
Carrying amount and estimated fair value of financial instruments |  |
Fair Value Inputs, Discount Rate | 0.2000 | 0.2000

X
- Definition Represents the gain realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References No definition available. + Details
Name: | thff_GainOnSaleOfSecuritiesNet
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=thff_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=thff_OtherRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |