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OTHER REAL ESTATE OWNED - Expenses Related to Foreclosed Assets Included in Loan Servicing and Foreclosure Expenses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Real Estate Owned, Disclosure of Detailed Components [Abstract]
Net gain on sales of other real estate owned	$ 17us-gaap_GainsLossesOnSalesOfOtherRealEstate	$ 0us-gaap_GainsLossesOnSalesOfOtherRealEstate
Operating expenses, net of rental income	0banc_ForeclosedRealEstateExpenseNetofRentalIncome	0banc_ForeclosedRealEstateExpenseNetofRentalIncome
Total	$ 17us-gaap_ProfitLossFromRealEstateOperations	$ 0us-gaap_ProfitLossFromRealEstateOperations

X

- Definition

Operating expenses, net of rental income, relating to other real estate and foreclosed assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14(d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 14

-Subparagraph d

-Article 9

+ Details

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

X

- Definition

The net cost of operation of other real estate (including provisions for real estate losses, rental income, and gains and losses on sales of real estate).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14(d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 14

-Subparagraph d

-Article 9

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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