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REGULATORY CAPITAL MATTERS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends declared, per common share (in dollars per share)	$ 0.24	$ 0.24	$ 0.24
Payments of ordinary dividends, common stock	$ 14,490	$ 12,843	$ 11,847
Payments of ordinary dividends, preferred stock and preference stock	$ 1,727	$ 8,322	$ 13,869
Common Stock
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common stock dividends declared and paid (in usd per share), Dividends, Per Share, Cash Paid	$ 0.24	$ 0.24	$ 0.24
Dividends declared, per common share (in dollars per share)	0.24	0.24	0.24
Quarterly dividends declared (in usd per share)	0.06	0.06	0.06
Quarterly dividends paid (in usd per share)	$ 0.06	$ 0.06	$ 0.06
Banc of California, NA
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Payments of dividends	$ 126,000

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