Document and Entity Information	3 Months Ended
	Mar. 31, 2013	Apr. 18, 2013
Document Information [Line Items]
Entity Registrant Name	TRI COUNTY FINANCIAL CORP /MD/
Entity Central Index Key	0000855874
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	TCFC
Entity Common Stock Shares Outstanding		3,052,385
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2013