| Cover Page Cover Page | Feb. 09, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 9, 2021 |
| Entity Registrant Name | BANC OF CALIFORNIA, INC. |
| Entity Incorporation, State or Country Code | MD |
| Entity File Number | 001-35522 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity CIK | 0001169770 |
| Amendment Flag | false |
| Common Stock [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | BANC |
| Security Exchange Name | NYSE |
| Series D Preferred Stock [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares -- 7.375% non-cumulative perpetual preferred stock, series D |
| Trading Symbol | BANC PRD |
| Security Exchange Name | NYSE |
| Series E Preferred Stock [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares -- 7.00% non-cumulative perpetual preferred stock, series E |
| Trading Symbol | BANC PRE |
| Security Exchange Name | NYSE |
