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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Troubled Debt Restructuring (Details) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Threshold period of consecutive payments to remove from nonaccrual status | 6 months

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- Definition Threshold Period of Consecutive Payments to Remove from Nonaccrual Status + References No definition available. + Details
Name: | banc_ThresholdPeriodofConsecutivePaymentstoRemovefromNonaccrualStatus
Namespace Prefix: | banc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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