Document and Entity Information	6 Months Ended
	Jun. 30, 2012	Aug. 03, 2012
Entity Registrant Name	CORNERSTONE BANCSHARES INC
Entity Central Index Key	0001038773
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	csbq
Entity Common Stock, Shares Outstanding		6,500,396
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2012
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2012