Document and Entity Information	3 Months Ended
	Mar. 31, 2012	May 14, 2015 Common Class A [Member]	May 14, 2015 Common Class B [Member]
Entity Information [Line Items]
Entity Registrant Name	Customers Bancorp, Inc.
Entity Central Index Key	0001488813
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		8,503,541	2,844,142
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2012