OTHER REAL ESTATE OWNED ("OREO") (Narrative) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Real Estate [Abstract]
Impaired loans secured by residential real estate	$ 0	$ 0

Carrying value of impaired loans with formal foreclosure proceedings in process.

No definition available.

Name:	tcfc_CarryingValueOfImpairedLoansWithFormalForeclosureProceedingsInProcess
Namespace Prefix:	tcfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant