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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Cash Flows [Abstract]
Transfer of loans receivable to loans held for, transfer from allowance for loan and lease losses	$ 0banc_TransferofPortfolioLoansandLeasestoHeldforsaleAllowance	$ 963banc_TransferofPortfolioLoansandLeasestoHeldforsaleAllowance

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- 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

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- Details

Name:	us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration