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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Servicing Rights (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Accounting Policies [Abstract] |  |
Servicing rights, held-for-sale, fair value | $ 66 | $ 29,800

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- Definition Servicing Asset at Fair Value, Amount, Held-For-Sale + References No definition available. + Details
Name: | banc_ServicingAssetatFairValueAmountHeldForSale
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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