Basis of Presentation, Risks and Uncertainties (Details)	Mar. 16, 2020	Mar. 03, 2020
Risks and Uncertainties [Abstract]
Reduction in overnight federal funds rate	1.00%	0.50%

Reduction in overnight federal funds rate during the period.

No definition available.

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