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RISK MANAGEMENT AND DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Assets | $ 429,917 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember | $ 205,658 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember
Derivatives asset, fair values | 13,555 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember | 6,379 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember
Other Assets | Interest rate lock commitments |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Assets | 429,917 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember | 179,923 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember
Derivatives asset, fair values | 13,555 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember | 5,750 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember
Other Assets | Mandatory forward commitments |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Assets | 0 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember | 25,735 us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember
Derivatives asset, fair values | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember | 629 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember
Accrued Expenses and Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Liability | 656,978 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember | 424,904 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember
Derivatives liability, fair values | 4,552 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember | 3,235 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember
Accrued Expenses and Other Liabilities | Interest rate lock commitments |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Liability | 9,978 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember | 10,075 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember
Derivatives liability, fair values | 98 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember | 197 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember
Accrued Expenses and Other Liabilities | Mandatory forward commitments |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Liability | 572,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember | 364,829 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember
Derivatives liability, fair values | 4,039 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember | 2,803 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember
Accrued Expenses and Other Liabilities | Interest rate swap |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Liability | 75,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 50,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Derivatives liability, fair values | $ 415 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 235 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = banc_AccruedExpensesandOtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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