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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Troubled Debt Restructuring (Details)	12 Months Ended
	Dec. 31, 2019
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