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RESTRUCTURINGS - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016
Restructuring and Related Activities [Abstract] |  |  |  |  |  |  |  |  |  |
Restructuring expense |  | $ 553 | $ 279 | $ 4,500 | $ 4,536 | $ 9,163 | $ 9,100 |  |  |
Percentage of workforce reduction | 9.00% |  |  |  |  |  |  |  |  |
Outstanding unpaid accrued liabilities |  | $ 688 | $ 285 | $ 688 | $ 688 | $ 285 | $ 202 | $ 2,681 | $ 687 | $ 0

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- Definition Restructuring Charges and Disposal Group, Including Discontinued Operation, Restructuring Charges + References No definition available. + Details
Name: | banc_RestructuringChargesandDisposalGroupIncludingDiscontinuedOperationRestructuringCharges
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Restructuring Reserve and Disposal Group, Including Discontinued Operations, Restructuring Reserve + References No definition available. + Details
Name: | banc_RestructuringReserveandDisposalGroupIncludingDiscontinuedOperationsRestructuringReserve
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Restructuring and Related Cost, Expected Number of Positions Eliminated, Percent + References No definition available. + Details
Name: | banc_RestructuringandRelatedCostExpectedNumberofPositionsEliminatedPercent
Namespace Prefix: | banc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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