Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Aug. 06, 2013
Document and entity [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	BNCN
Entity Registrant Name	BNC BANCORP
Entity Central Index Key	0001210227
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		26,486,710