v3.22.2.2
DEI Document
Dec. 02, 2022
Entity Information [Line Items]  
Entity Central Index Key 0001212545
Amendment Flag false
Document Type 8-K
Document Period End Date Dec. 02, 2022
Entity Incorporation, State or Country Code DE
Entity File Number 001-32550
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Tax Identification Number 88-0365922
Entity Registrant Name WESTERN ALLIANCE BANCORPORATION
Entity Address, Address Line One One E. Washington Street
Entity Address, City or Town Phoenix
Entity Address, State or Province AZ
Entity Address, Postal Zip Code 85004
City Area Code 602
Local Phone Number 389-3500
Common Stock [Member]  
Entity Information [Line Items]  
Title of 12(b) Security Common Stock, $0.0001 Par Value
Trading Symbol WAL
Security Exchange Name NYSE
Noncumulative Preferred Stock  
Entity Information [Line Items]  
Title of 12(b) Security Depositary Shares, Each Representing a 1/400th Interest in a Share of 4.250% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series A
Trading Symbol WAL PrA
Security Exchange Name NYSE