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REGULATORY CAPITAL MATTERS - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
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 $ 0.13 $ 0.13 $ 0.13 $ 0.13  
Dividends payment         $ 94.3
Banc of California, NA          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Earnings available for dividend distribution $ 104.3       $ 104.3