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Cover
Dec. 22, 2025
Document Type 8-K
Amendment Flag false
Document Period End Date Dec. 22, 2025
Entity File Number 001-35542
Entity Registrant Name Customers Bancorp, Inc.
Entity Central Index Key 0001488813
Entity Tax Identification Number 27-2290659
Entity Incorporation, State or Country Code PA
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
Voting Common Stock, par value $1.00 per share  
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  
Title of 12(b) Security Fixed-to-Floating Rate Non-Cumulative Perpetual
Trading Symbol CUBI/PF
Security Exchange Name NYSE
5.375% Subordinated Notes due 2034  
Title of 12(b) Security 5.375% Subordinated Notes due 2034
Trading Symbol CUBB
Security Exchange Name NYSE