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RELATED-PARTY TRANSACTIONS - Current Related Party Indemnification Costs (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 06, 2015	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Expenses from transactions with related parties	$ 263
Special Committee Investigation | General Counsel
Related Party Transaction [Line Items]
Expenses from transactions with related parties		$ 501	$ 0

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=banc_SpecialCommitteeInvestigationIndemnificationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=banc_GeneralCounselMember
Namespace Prefix:
Data Type:	na
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Period Type: