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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
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Mar. 31, 2015 | Mar. 31, 2014
Representations and Warranties Obligations and Corporate Guarantees |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | $ 8,303 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember | $ 5,427 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember
Provision for loan repurchases | 1,328 us-gaap_LossContingencyAccrualProvision / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember | 571 us-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 | $ 8,432 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember | $ 5,866 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember

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- 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
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- 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
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- 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
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- Details
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