XML 206 R188.htm IDEA: XBRL DOCUMENT
v3.8.0.1

RELATED-PARTY TRANSACTIONS - Sale of Shares to and Purchase of Shares from SECT (Details) - shares | Dec. 28, 2017 | Feb. 13, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Greater Than 5% Shareholder, Evercore Trust Company |  |  |
Related Party Transaction [Line Items] |  |  |
Common stock, shares outstanding (in shares) |  |  | 2,500,000
Company ownership percentage maximum threshold |  | 5.00% |
Common Stock | Variable Interest Entity, Primary Beneficiary |  |  |
Related Party Transaction [Line Items] |  |  |
Number of shares repurchased (in shares) | 2,500,000 |  |

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 Stock Employee Compensation Trust, Shares Repurchased + References No definition available. + Details
Name: | banc_StockEmployeeCompensationTrustSharesRepurchased
Namespace Prefix: | banc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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=84159872&loc=d3e21463-112644 + Details
Name: | us-gaap_CommonStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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_RelatedPartyTransactionsByRelatedPartyAxis=banc_GreaterThan5ShareholderEvercoreTrustCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |