XML 124 R70.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

ALLOWANCE FOR LOAN LOSSES: ALLOWANCE FOR LOAN LOSSES: (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward] |  |  |
January 1, | $ 4,806 | $ 7,034 | $ 8,565
Added | 570 | 1,279 | 613
Charged Off | (105) | (153) | (430)
Payments | (1,077) | (3,354) | (1,714)
December 31, | 4,194 | 4,806 | 7,034
Commercial |  |  |
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward] |  |  |
January 1, | 145 | 2,709 | 3,386
Added | 0 | 0 | 0
Charged Off | 0 | 0 | 0
Payments | (134) | (2,564) | (677)
December 31, | 11 | 145 | 2,709
Residential |  |  |
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward] |  |  |
January 1, | 4,043 | 3,611 | 4,447
Added | 195 | 984 | 227
Charged Off | (24) | (16) | (289)
Payments | (729) | (536) | (774)
December 31, | 3,485 | 4,043 | 3,611
Consumer |  |  |
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward] |  |  |
January 1, | 618 | 714 | 732
Added | 375 | 295 | 386
Charged Off | (81) | (137) | (141)
Payments | (214) | (254) | (263)
December 31, | $ 698 | $ 618 | $ 714

X
- Definition Financing Receivable, Impaired, Troubled Debt Restructuring, Additions During Period + References No definition available. + Details
Name: | thff_FinancingReceivableImpairedTroubledDebtRestructuringAdditionsDuringPeriod
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Impaired, Troubled Debt Restructuring, Payments During Period + References No definition available. + Details
Name: | thff_FinancingReceivableImpairedTroubledDebtRestructuringPaymentsDuringPeriod
Namespace Prefix: | thff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward] + References No definition available. + Details
Name: | thff_FinancingReceivableImpairedTroubledDebtRestructuringRollForward
Namespace Prefix: | thff_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |