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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Summary of Loans Purchased and Sold (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 USD ($) bulk_loan_acquisition | Sep. 30, 2016 USD ($) bulk_loan_acquisition | Sep. 30, 2017 USD ($) bulk_loan_acquisition | Sep. 30, 2016 USD ($) bulk_loan_acquisition
Receivables [Abstract] |  |  |  |
Number of purchase transactions | bulk_loan_acquisition | 0 | 1 | 0 | 1
Total unpaid principal balance of purchased PCI loans at acquisition | $ 0 | $ 103,799 | $ 0 | $ 103,799
Total fair value of purchased PCI loans at acquisition | $ 0 | $ 90,984 | $ 0 | $ 90,984

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- Definition Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Acquired During Period, Fair Value With Credit Deterioration At Acquisition + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Acquired During Period, Unpaid Principal Balance With Credit Quality Deterioration At Acquisition + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Number of Bulk Loan Acquisitions + References No definition available. + Details
Name: | banc_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesAcquiredDuringPeriodNumberofBulkLoanAcquisitions
Namespace Prefix: | banc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration