Name:	trst_DeferralPeriodOfPastDueLoans
Namespace Prefix:	trst_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Number of days past due when loan is considered to be in payment default under the modified terms, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	trst_NumberOfDaysPastDueLoanConsideredInPaymentDefault
Namespace Prefix:	trst_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

No definition available.

Name:	trst_NumberOfDaysPastDueWhenLoansConsideredInPaymentDefaultUnderModifiedTerms
Namespace Prefix:	trst_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Number of economic scenarios evaluated by management.

No definition available.

Name:	trst_NumberOfEconomicScenariosEvaluated
Namespace Prefix:	trst_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Percentage of weighting the company has elected to utilize in stagflation scenario.

No definition available.

Name:	trst_PercentageOfWeightingUtilizedInStagflationScenario
Namespace Prefix:	trst_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Period company has determined to use reasonable and supportable forecast of unemployment rates within the key metropolitan areas in New York and Florida, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	trst_PeriodConsideredForReasonableAndSupportableForecast
Namespace Prefix:	trst_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.