Related Party Transaction, Company Ownership Percentage

No definition available.

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Namespace Prefix:	banc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related Party Transaction, Company Ownership Percentage Maximum Threshold

+ References

No definition available.

+ Details

Name:	banc_RelatedPartyTransactionCompanyOwnershipPercentageMaximumThreshold
Namespace Prefix:	banc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

+ Details

Name:	us-gaap_CommonStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=banc_GreaterThan5ShareholderPLCapitalAdvisorsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=banc_VotingCommonStockMember
Namespace Prefix:
Data Type:	na
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Period Type:

RELATED-PARTY TRANSACTIONS - PL Capital Affiliates (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 06, 2015	Mar. 31, 2017	Feb. 10, 2017
Related Party Transaction [Line Items]
Expenses from transactions with related parties	$ 263
Greater Than 5% Shareholder, PL Capital Advisors, LLC
Related Party Transaction [Line Items]
Ownership percentage			6.90%
Expenses from transactions with related parties		$ 150
Voting Common Stock \| Greater Than 5% Shareholder, PL Capital Advisors, LLC
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares)			3,401,719
Company ownership percentage maximum threshold			10.00%