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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Percentage of investment company taxable income	90.00%
Percentage of investment company net tax exempt income	90.00%
Federal excise tax	$ 0.6	$ 0.6

X

- Definition

Federal excise tax.

+ References

No definition available.

+ Details

Name:	trin_FederalExciseTax
Namespace Prefix:	trin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of investment company net tax exempt income.

+ References

No definition available.

+ Details

Name:	trin_PercentageOfInvestmentCompanyNetTaxExemptIncome
Namespace Prefix:	trin_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of investment company taxable income.

+ References

No definition available.

+ Details

Name:	trin_PercentageOfInvestmentCompanyTaxableIncome
Namespace Prefix:	trin_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration