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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Accruing and Non-accrual Troubled Debt Restructurings (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Accruing TDRs	$ 5.7	$ 5.6
Non-accrual TDRs	$ 2.3	$ 2.7

X

- Definition

Financing Receivable, Modifications, Recorded Investment, Accrual Status

+ References

No definition available.

+ Details

Name:	banc_FinancingReceivableModificationsRecordedInvestmentAccrualStatus
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Financing Receivable, Modifications, Recorded Investment, Nonaccrual Status

+ References

No definition available.

+ Details

Name:	banc_FinancingReceivableModificationsRecordedInvestmentNonaccrualStatus
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration