FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Loans with impairment, unpaid principal	$ 2.2	$ 6.3

Impaired Financing Receivable Unpaid Principal Balance Before Write Offs

No definition available.

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