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Document and Entity Information
Jul. 28, 2021
Jan. 27, 2021
Entity Information [Line Items]    
Amendment Flag   false
Entity Incorporation, State or Country Code PA  
Document Type 8-K  
Document Period End Date Jul. 28, 2021  
Entity Registrant Name   Customers Bancorp, Inc.
Entity File Number 001-35542  
Entity Tax Identification Number 27-2290659  
Entity Address, Address Line One 701 Reading Avenue  
Entity Address, City or Town West Reading  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 19611  
City Area Code 610  
Local Phone Number 933-2000  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Entity Emerging Growth Company false  
Entity Central Index Key   0001488813
Voting Common Stock, par value $1.00 per share | New York Stock Exchange    
Entity Information [Line Items]    
Title of 12(b) Security Voting Common Stock, par value $1.00 per share  
Trading Symbol CUBI  
Security Exchange Name NYSE  
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series C, par value $1.00 per share | New York Stock Exchange    
Entity Information [Line Items]    
Title of 12(b) Security Fixed-to-Floating Rate Non-Cumulative PerpetualPreferred Stock, Series C, par value $1.00 per share  
Trading Symbol CUBI/PC  
Security Exchange Name NYSE  
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, par value $1.00 per share | New York Stock Exchange    
Entity Information [Line Items]    
Title of 12(b) Security Fixed-to-Floating Rate Non-Cumulative PerpetualPreferred Stock, Series D, par value $1.00 per share  
Trading Symbol CUBI/PD  
Security Exchange Name NYSE  
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, par value $1.00 per share | New York Stock Exchange    
Entity Information [Line Items]    
Title of 12(b) Security Fixed-to-Floating Rate Non-Cumulative PerpetualPreferred Stock, Series E, par value $1.00 per share  
Trading Symbol CUBI/PE  
Security Exchange Name NYSE  
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series F, par value $1.00 per share | New York Stock Exchange    
Entity Information [Line Items]    
Title of 12(b) Security Fixed-to-Floating Rate Non-Cumulative PerpetualPreferred Stock, Series F, par value $1.00 per share  
Trading Symbol CUBI/PF  
Security Exchange Name NYSE  
Subordinated Debt [Member] | New York Stock Exchange    
Entity Information [Line Items]    
Title of 12(b) Security 5.375% Subordinated Notes due 2034  
Trading Symbol CUBB  
Security Exchange Name NYSE