Document and Entity Information	6 Months Ended
	Jun. 30, 2012	Aug. 14, 2012 Common Class A	Aug. 14, 2012 Common Class B
Entity Information [Line Items]
Entity Registrant Name	Customers Bancorp, Inc.
Entity Central Index Key	0001488813
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		8,579,310	2,844,142
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2012