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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2022
Feb. 24, 2023
Jun. 30, 2022
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-35542    
Entity Registrant Name Customers Bancorp, Inc.    
Entity Incorporation, State or Country Code PA    
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    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1,032,069,330
Entity Common Stock, Shares Outstanding   31,601,910  
Documents Incorporated by Reference Portions of the registrant’s definitive proxy statement to be delivered to shareholders in connection with the 2023 Annual Meeting of Shareholders are incorporated by reference into Part III of this Annual Report.    
Entity Central Index Key 0001488813    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false    
Voting Common Stock, par value $1.00 per share      
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 E, par value $1.00 per share      
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      
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    
5.375% Subordinated Notes due 2034      
Entity Information [Line Items]      
Title of 12(b) Security 5.375% Subordinated Notes due 2034    
Trading Symbol CUBB    
Security Exchange Name NYSE