Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Cash and Cash Equivalents [Abstract]
Federal reserve requirement	$ 0	$ 0

Balance maintained with the Federal Reserve Bank to meet reserve requirements pursuant to Federal Banking Regulations.

No definition available.

Name:	trst_FederalReserveBankReserveRequirement
Namespace Prefix:	trst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant