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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Statement of Cash Flows [Abstract] |  |
Transfer of loans receivable to loans held for, transfer from allowance for loan and lease losses | $ 0 | $ 0

X
- Definition Transfer of Portfolio Loans and Leases to Held-for-sale, Allowance + References No definition available. + Details
Name: | banc_TransferofPortfolioLoansandLeasestoHeldforsaleAllowance
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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