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RESTRUCTURING - Restructuring Reserve (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Reserve [Roll Forward] |  |  |
Balance at beginning of period | $ 1,204 | $ 117 | $ 202
Accrual/Expense | 0 | 4,263 | 4,431
Payments | (1,204) | (3,176) | (4,516)
Balance at end of period | $ 0 | $ 1,204 | $ 117

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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 Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 + Details
Name: | us-gaap_PaymentsForRestructuring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_RestructuringReserveRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration