XML 61 R50.htm IDEA: XBRL DOCUMENT
v3.8.0.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) banking_office segment | Sep. 30, 2016 USD ($) | Dec. 31, 2016 segment
Accounting Policies [Abstract] |  |  |  |  |  |
Number of banking offices | banking_office |  |  |  | 34 |  |
Number of reportable segments | segment |  |  |  | 1 |  | 3
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Salaries and employee benefits | $ 30,216 |  | $ 37,133 | $ 96,007 | $ 103,347 |
Reversal of Excess Accrual |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Salaries and employee benefits |  | $ 7,800 |  |  |  |

X
- Definition Number of offices included in Nature of Operations disclosure. + References No definition available. + Details
Name: | banc_NumberOfBankingOffices
Namespace Prefix: | banc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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_ChangeInAccountingEstimateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_LaborAndRelatedExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ChangeInAccountingEstimateByTypeAxis=banc_ReversalofExcessAccrualMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |