Ownership Distribution Post Close (Details)	Dec. 31, 2023 $ / shares Rate
Investor
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
BANC Common Stockholders Post Merger, Shares | $ / shares	$ 32,520,000
BANC Common Stockholders Post Merger, Percentage | Rate	19.30%
BANC
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
BANC Common Stockholders Post Merger, Shares | $ / shares	$ 57,158,000
BANC Common Stockholders Post Merger, Percentage | Rate	33.90%
Banc of California
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
BANC Common Stockholders Post Merger, Shares | $ / shares	$ 168,488,000
BANC Common Stockholders Post Merger, Percentage | Rate	100.00%
Pacific Western Bank
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
BANC Common Stockholders Post Merger, Shares | $ / shares	$ 78,810,000
BANC Common Stockholders Post Merger, Percentage | Rate	46.80%