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OFF-BALANCE SHEET COMMITMENTS - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | $ 126,760 banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember | $ 87,517 banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Variable Rate | 94,011 banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember | 82,818 banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Unused lines of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 35,865 banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember | 20,631 banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember
Variable Rate | 310,839 banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember | 295,626 banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember
Letters of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 810 banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember | 825 banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember
Variable Rate | $ 11,140 banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember | $ 10,411 banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember

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- Definition Other Commitments, Off-Balance Sheet Risk, Fixed Rate Financial Instrument + References No definition available. + Details
Name: | banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Commitments, Off-Balance Sheet Risk, Variable Rate Financial Instrument + References No definition available. + Details
Name: | banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_UnusedLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |