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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Other Commitments [Line Items]
Commitments to make loans, period, maximum	30 days
Commitments to sell loans under residential mortgage division	$ 999.9
TBAs commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	950.0
Best efforts commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	49.9
Interest rate lock commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	$ 512.1

X

- Definition

Other Commitments, Origination of Loans, Period

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
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- Definition

Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064133&loc=d3e61044-112788

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=68064133&loc=d3e61082-112788

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- 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.

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- Details

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