Hypothetical PACW issue to give BANC (Details) shares in Thousands	Nov. 30, 2023 Rate shares
Banc of California
Business Acquisition [Line Items]
Shares, Outstanding	87,932
Banc of California | Pro Forma
Business Acquisition [Line Items]
Shares, Outstanding	87,932
Percentage of common stock outstanding | Rate	42.30%
Pacific Western Bank | Pro Forma
Business Acquisition [Line Items]
Shares, Outstanding	119,969
Percentage of common stock outstanding | Rate	57.70%
BANC | Pro Forma
Business Acquisition [Line Items]
Shares, Outstanding	207,901
Percentage of common stock outstanding | Rate	100.00%