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Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2018
May 04, 2018
Document And Entity Information [Abstract]    
Document Type 10-Q/A  
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 March 31, 2018.  
Document Period End Date Mar. 31, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Trading Symbol CUBI  
Entity Registrant Name Customers Bancorp, Inc.  
Entity Central Index Key 0001488813  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   31,498,221