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Cover Page - shares
 6 Months Ended
Jun. 30, 2019
Aug. 05, 2019
Document Information [Line Items]    
Document Transition Report false  
Document Quarterly Report true  
Document Type 10-Q  
Entity File Number 001-35522  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
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 3 MacArthur Place  
Entity Address, City or Town Santa Ana  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92707  
City Area Code 855  
Local Phone Number 361-2262  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity Central Index Key 0001169770  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Common Stock    
Document Information [Line Items]    
Trading Symbol BANC  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Entity Common Stock, Shares Outstanding   50,402,771
Security Exchange Name NYSE  
Series D 7.375% non-cumulative perpetual    
Document Information [Line Items]    
Trading Symbol BANC PRD  
Title of 12(b) Security Depositary Shares -- 7.375% non-cumulative perpetual preferred stock, series D  
Security Exchange Name NYSE  
Series E 7.00% non-cumulative perpetual    
Document Information [Line Items]    
Trading Symbol BANC PRE  
Title of 12(b) Security Depositary Shares -- 7.00% non-cumulative perpetual preferred stock, series E  
Security Exchange Name NYSE  
Class B Non-Voting Non-Convertible Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   477,321