XML 152 R140.htm IDEA: XBRL DOCUMENT v3.8.0.1

RELATED-PARTY TRANSACTIONS - Former Related Party Indemnification Costs and Settlement Agreement (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Feb. 14, 2018	Apr. 06, 2015	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Expenses from transactions with related parties		$ 263
Special Committee Investigation Indemnification | Former President And Chief Executive Officer
Related Party Transaction [Line Items]
Expenses from transactions with related parties			$ 265	$ 3,000	$ 573
Special Committee Investigation Indemnification | Former Management Vice Chair
Related Party Transaction [Line Items]
Expenses from transactions with related parties			71	1,400	57
Special Committee Investigation Indemnification | Former Interim Chief Financial Officer and Chief Strategy Officer and Former Chief Financial Officer
Related Party Transaction [Line Items]
Expenses from transactions with related parties			11	631	135
Special Committee Investigation Indemnification | Former Director
Related Party Transaction [Line Items]
Expenses from transactions with related parties			$ 5	$ 509	$ 29
Termination Of Employment Settlement Agreement | Former Management Vice Chair
Related Party Transaction [Line Items]
Expenses from transactions with related parties	$ 4,300
Company ownership percentage maximum threshold	4.99%
Termination Of Employment Settlement Agreement, Cash Proceeds From Unvested Stock Options And Restricted Stock Awards | Former Management Vice Chair
Related Party Transaction [Line Items]
Expenses from transactions with related parties	$ 576
Termination Of Employment Settlement Agreement, Reimbursement For Health Care Premiums | Former Management Vice Chair
Related Party Transaction [Line Items]
Expenses from transactions with related parties	38
Termination Of Employment Settlement Agreement, Attorneys Fees | Former Management Vice Chair
Related Party Transaction [Line Items]
Expenses from transactions with related parties	$ 650

X

- 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

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

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
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

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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_FormerPresidentAndChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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