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OFF-BALANCE SHEET COMMITMENTS - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | $ 92,151 | $ 87,517
Variable Rate | 99,040 | 82,818
Unused lines of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 21,877 | 20,631
Variable Rate | 331,061 | 295,626
Letters of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 760 | 825
Variable Rate | $ 10,290 | $ 10,411

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_UnusedLinesOfCreditMember
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: |