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OTHER REAL ESTATE OWNED - Expenses Related to Foreclosed Assets Included in Loan Servicing and Foreclosure Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Real Estate Owned, Disclosure of Detailed Components [Abstract]
Net gain (loss) on sales	$ 6	$ 0	$ 23	$ 0
Operating expenses, net of rental income	0	0	0	0
Total	$ 6	$ 0	$ 23	$ 0

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_
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Balance Type:	debit
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- 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

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- 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

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- References

No definition available.

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