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Investments in Securities and Fair Value Investments in Securities (Schedule of Variable Interest Entities) (Details) - Other Investments $ in Thousands	Dec. 31, 2022 USD ($)
Variable Interest Entity [Line Items]
VariableInterestEntityNonconsolidatedCarryingAmount	$ 11,689
Variable Interest Entity, Nonconsolidated, Estimated Fair Value	13,193
Variable Interest Entity, Reporting Entity Involvement, Maximum Potential Loss	18,978
Real estate LLCs or LPs
Variable Interest Entity [Line Items]
VariableInterestEntityNonconsolidatedCarryingAmount	3,320
Variable Interest Entity, Nonconsolidated, Estimated Fair Value	5,014
Variable Interest Entity, Reporting Entity Involvement, Maximum Potential Loss	4,658
Small business investment LLCs or LPs
Variable Interest Entity [Line Items]
VariableInterestEntityNonconsolidatedCarryingAmount	8,369
Variable Interest Entity, Nonconsolidated, Estimated Fair Value	8,179
Variable Interest Entity, Reporting Entity Involvement, Maximum Potential Loss	$ 14,320

X

- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary

+ References

No definition available.

+ Details

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Namespace Prefix:	itic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Estimated fair value amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

No definition available.

+ Details

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Namespace Prefix:	itic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123419778&loc=d3e5747-111685

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=123419778&loc=d3e5728-111685

+ Details

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Balance Type:	credit
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

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- Details

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- Details

Name:	srt_ConsolidatedEntitiesAxis=itic_VariableInterestEntityNotPrimaryBeneficiaryRealEstateLLCorLPMemberMember
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- Details

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