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REGULATORY CAPITAL MATTERS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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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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