| Document and Entity Information | Nov. 28, 2023 |
| Entity Listings [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 28, 2023 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 001-35522 |
| Entity Registrant Name | BANC OF CALIFORNIA, INC. |
| Entity Central Index Key | 0001169770 |
| 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 | 361-2262 |
| Entity Emerging Growth Company | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Common Stock [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | BANC |
| Security Exchange Name | NYSE |
| Depositary Shares, each representing a 1/40th interest in a share of 7.75% non-cumulative perpetual preferred stock, Series F [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Depositary Shares, each representing a 1/40th interest in a share of 7.75% non-cumulative perpetual preferred stock, Series F |
| Trading Symbol | BANC PRF |
| Security Exchange Name | NYSE |
