Related Party Transaction, Company Ownership Percentage

No definition available.

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

- Definition

Related Party Transaction, Securities Purchase Agreement, Aggregate Purchase Price

+ References

No definition available.

+ Details

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

- Definition

Related Party Transaction, Securities Purchase Agreement, Common Stock Issuable

+ References

No definition available.

+ Details

Name:	banc_RelatedPartyTransactionSecuritiesPurchaseAgreementCommonStockIssuable
Namespace Prefix:	banc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Securities Purchase Agreement, Price Per Share Issuable

+ References

No definition available.

+ Details

Name:	banc_RelatedPartyTransactionSecuritiesPurchaseAgreementPricePerShareIssuable
Namespace Prefix:	banc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Tier One Risk Based Capital to Risk Weighted Assets, Calculated To Include Future Events

+ References

No definition available.

+ Details

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

- Definition

The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

The change in cash surrender or contract value during the period which adjusted the amount of premiums paid in determining the expense or income recognized under the contract for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6384439&loc=d3e42048-111605

+ Details

Name:	us-gaap_LifeInsuranceCorporateOrBankOwnedChangeInValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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_GreaterThan5ShareholderPatriotMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

RELATED-PARTY TRANSACTIONS - Transactions with Patriot Affiliates (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 15, 2015	Jul. 14, 2015	Apr. 06, 2015	Oct. 30, 2014	Jun. 30, 2016	Dec. 31, 2015	Nov. 07, 2014
Related Party Transaction [Line Items]
Increase is bank-owned life insurance	$ 30,000	$ 50,000
Bank-owned life insurance					$ 101,314	$ 100,171
Tier 1 risk based capital including future event					10.40%
Expenses from transactions with related parties			$ 263
Greater Than 5% Shareholder, Patriot
Related Party Transaction [Line Items]
Aggregate purchase price				$ 20,000
Greater Than 5% Shareholder, Patriot \| Equity Support Payment
Related Party Transaction [Line Items]
Expenses from transactions with related parties				538
Greater Than 5% Shareholder, Patriot \| Reimbursement of Out-of-Pocket Expenses
Related Party Transaction [Line Items]
Expenses from transactions with related parties				$ 100
Greater Than 5% Shareholder, Patriot \| Voting Common Stock
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares)						3,100,564	3,100,564
Ownership percentage						8.20%	9.30%
Greater Than 5% Shareholder, Patriot \| Voting Common Stock \| Voting Common Stock Option One
Related Party Transaction [Line Items]
Common stock issuable (in shares)				1,076,000
Price per share issuable				$ 9.78
Greater Than 5% Shareholder, Patriot \| Voting Common Stock \| Voting Common Stock Option Two
Related Party Transaction [Line Items]
Common stock issuable (in shares)				824,000
Price per share issuable				$ 11.55