Fair Value Measurements - Summary of Foreclosed Assets Remeasured and Recorded at Fair Value (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Foreclosed assets remeasured subsequent to initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$ 1,676
Fair value of foreclosed assets remeasured subsequent to initial recognition	$ 1,676

Fair value of foreclosed assets remeasured subsequent to initial recognition.

No definition available.

Name:	tcbx_FairValueOfForeclosedAssetsRemeasuredSubsequentToInitialRecognition
Namespace Prefix:	tcbx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant