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MORTGAGE BANKING ACTIVITIES - Summary of Activities in Reserve for Loss Reimbursements on Sold Loans (Detail) (Representations and Warranties Obligations and Corporate Guarantees, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Representations and Warranties Obligations and Corporate Guarantees
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period	$ 8,303us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember	$ 5,427us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember
Provision for loan repurchases	1,328us-gaap_LossContingencyAccrualProvision / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember	571us-gaap_LossContingencyAccrualProvision / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember
Payments made for loss reimbursement on sold loans	(1,199)us-gaap_LossContingencyAccrualCarryingValuePayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember	(132)us-gaap_LossContingencyAccrualCarryingValuePayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember
Balance at end of period	$ 8,432us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember	$ 5,866us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember

X

- Definition

Amount of loss contingency liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of payments made reducing loss contingency liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyAccrualCarryingValuePayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyAccrualProvision
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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