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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Allowance for Loan and Lease Losses Additional Information (Details) $ in Millions	6 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) rolling_quarter	Dec. 31, 2016 USD ($) rolling_quarter
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk monitoring lock back period | rolling_quarter		39	28
Increase ALLL from enhancement of loss emergence period	$ 1.9
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserve for unfunded loan commitments		$ 3.7	$ 2.4

X

- Definition

Allowance For Loan And Lease Losses, Increase (Decrease) Due To Enhancement Of Loss Emergence Period

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Allowance for Loan and Lease Losses, Comparative Analysis, Look-back Period

+ References

No definition available.

+ Details

Name:	banc_AllowanceforLoanandLeaseLossesComparativeAnalysisLookbackPeriod
Namespace Prefix:	banc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
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