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REGULATORY CAPITAL MATTERS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Quarterly dividend (in usd per share) |  |  |  | $ 0.13 | $ 0.24 | $ 0.31 | $ 0.52
Minimum |  |  |  |  |  |  |
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 | $ 0.06 | $ 0.06 | $ 0.06 |  |  |  |
Quarterly dividend (in usd per share) | $ 0.06 | $ 0.06 | $ 0.06 |  |  |  |
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 | 0.31 |
Quarterly dividend (in usd per share) |  |  |  |  | 0.24 | $ 0.31 |
Preferred 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 |  |  |  |  | 0.06 |  |
Quarterly dividend (in usd per share) |  |  |  |  | $ 0.06 |  |
Banc of California, NA |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Payments of dividends |  |  |  |  | $ 37.0 |  |

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