Basis of Presentation, Loans (Details)	12 Months Ended
Dec. 31, 2021
Loans [Abstract]
Non-payment period of loans moved to non-accrual status	90 days

The past due period before for loans considered to be in payment default, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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