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            <endDate>2026-03-06</endDate>
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    <dei:AmendmentFlag
      contextRef="c20260306to20260306"
      id="Fact_be61cdcfee754f788e70a973963e363a">false</dei:AmendmentFlag>
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      contextRef="c20260306to20260306"
      id="Fact_ba6a8a70384c468eb029ac6feaf267d4">0001169770</dei:EntityCentralIndexKey>
    <dei:DocumentType
      contextRef="c20260306to20260306"
      id="Fact_384b70d171a3448da87c69c47d356bf5">8-K</dei:DocumentType>
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      contextRef="c20260306to20260306"
      id="Fact_369c3223a065490a93b25ee23a01dcae">2026-03-06</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="c20260306to20260306"
      id="Fact_fe20b02e3ea04cf1a5d072093a682cc2">BANC OF CALIFORNIA, INC.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
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      id="Fact_3ad666bac21647da930eebc0c4f24315">MD</dei:EntityIncorporationStateCountryCode>
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      contextRef="c20260306to20260306"
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    <dei:EntityAddressAddressLine1
      contextRef="c20260306to20260306"
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      contextRef="c20260306to20260306"
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    <dei:EntityAddressCityOrTown
      contextRef="c20260306to20260306"
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      id="Fact_4989cc610f3f4a5799a4defab3d5b49a">361-2262</dei:LocalPhoneNumber>
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      contextRef="c20260306to20260306"
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      contextRef="c20260306to20260306"
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    <dei:EntityEmergingGrowthCompany
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      contextRef="c20260306to20260306_StatementClassOfStockAxis_CommonStockMember"
      id="Fact_c87b58ef6dc54b12917a319e31119631">Common Stock, par value $0.01 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="c20260306to20260306_StatementClassOfStockAxis_CommonStockMember"
      id="Fact_7a1ee05fcf89464b8259f225ff1770ad">BANC</dei:TradingSymbol>
    <dei:SecurityExchangeName
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    <dei:Security12bTitle
      contextRef="c20260306to20260306_StatementClassOfStockAxis_SeriesFPreferredStockMember"
      id="Fact_f39c3e02a57d4fd08428484e7c3e542b">Depositary Shares, each representing a 1/40th interest in a share of 7.75% fixed rate reset non-cumulative perpetual preferred stock, Series F</dei:Security12bTitle>
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