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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 20, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2023    
Entity File Number 001-35522    
Entity Registrant Name BANC OF CALIFORNIA, INC.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 04-3639825    
Entity Address, Address Line One 11611 San Vicente Boulevard,    
Entity Address, Address Line Two Suite 500    
Entity Address, City or Town Los Angeles    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90049    
City Area Code 855    
Local Phone Number -2262    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol BANC    
Security Exchange Name NYSE    
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     $ 614.8
Entity Common Stock, Shares Outstanding   156,794,260  
Documents Incorporated by Reference [Text Block]
The information required by Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K will be found in the Company's definitive proxy statement for its 2024 Annual Meeting of Stockholders, to be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, and such information is incorporated herein by this reference.
    
Entity Central Index Key 0001169770    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Firm ID 185    
Auditor Location Irvine, CA    
Auditor Name KPMG LLP    
Document Financial Statement Error Correction [Flag] false