Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Nov. 02, 2020
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
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	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 Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001169770
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	BANC
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		49,762,971
Series D 7.375% non-cumulative perpetual
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares each representing a 1/40th interest in a share of 7.375% Non-Cumulative Perpetual Preferred Stock, Series D
Trading Symbol	BANC PRD
Security Exchange Name	NYSE
Series E 7.00% non-cumulative perpetual
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares each representing a 1/40th interest in a share of 7.00% Non-Cumulative Perpetual Preferred Stock, Series E
Trading Symbol	BANC PRE
Security Exchange Name	NYSE
Class B Non-Voting Non-Convertible Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		477,321