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SERVICING RIGHTS - Composition of Total Income (Loss) From Servicing Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Transfers and Servicing [Abstract] |  |  |
Servicing fees for sold loans with servicing retained | $ 1,096 | $ 1,291 | $ 5,048
Losses on the fair value and amortization of servicing rights | (591) | (612) | (1,328)
Total income from servicing rights | $ 505 | $ 679 | $ 3,720

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- Definition Bank Servicing Fees, Gross, and Disposal Group, Including Discontinued Operation, Bank Servicing Fees, Gross + References No definition available. + Details
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- Definition Bank Servicing Fees, and Disposal Group, Including Discontinued Operation, Bank Servicing Fees + References No definition available. + Details
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Namespace Prefix: | banc_
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Balance Type: | credit
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- Definition Mortgage Servicing Rights (MSR) Impairment (Recovery) and Disposal Group, Including Discontinued Operation, Mortgage Servicing Rights (MSR) Impairment (Recovery) + References No definition available. + Details
Name: | banc_MortgageServicingRightsMSRImpairmentRecoveryandDisposalGroupIncludingDiscontinuedOperationMortgageServicingRightsMSRImpairmentRecovery
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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