XML 15 R1.htm IDEA: XBRL DOCUMENT v3.10.0.1
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2017
Feb. 16, 2018
Jun. 30, 2017
Document And Entity Information [Abstract]      
Entity Registrant Name Customers Bancorp, Inc.    
Entity Central Index Key 0001488813    
Trading Symbol CUBI    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K/A    
Document Period End Date Dec. 31, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Amendment Flag true    
Amendment Description As previously reported on its Current Report on Form 8-K, which was filed with the SEC on November 13, 2018, Customers Bancorp, Inc. is restating its previously issued audited consolidated financial statements for 2017, 2016 and 2015 and its interim unaudited consolidated financial statements as of and for the three months ended March 31, 2018 and 2017 and the three and six months ended June 30, 2018 and 2017, because of misclassifications of cash flow activities associated with its commercial mortgage warehouse lending activities between operating and investing activities on the consolidated statements of cash flows because the related loan balances were incorrectly classified as held for sale rather than held for investment on the consolidated balance sheets. Accordingly, management has concluded that the control deficiency that resulted in these incorrect classifications constituted a material weakness in internal control over financial reporting. Solely as a result of this material weakness, management revised its earlier assessment and has now concluded that its disclosure controls and procedures were not effective at December 31, 2017.    
Entity Common Stock, Shares Outstanding   31,439,416  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 814,989,106