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BUSINESS COMBINATIONS - Banco Popular's California Branch Network Acquisition (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended |  |  |
--- | --- | --- | --- | ---
Nov. 08, 2014 | Mar. 31, 2015 | Dec. 31, 2014 | Nov. 07, 2014
Fair value adjustments |  |  |  |
Goodwill |  | $ 31,591 us-gaap_Goodwill | $ 31,591 us-gaap_Goodwill |
Banco Popular Branches |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total Consideration | 27,941 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Fair value adjustments |  |  |  |
Loans receivable | (12,165)banc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLoansReceivable / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Core deposit intangibles | 15,777 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Certificates of deposit purchase premium | (916)banc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCertificateofDepositsPurchasePremium / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Premises and equipment | 1,218 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Total fair value adjustments | 3,914 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Fair value of net assets acquired | 27,941 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Goodwill | 0 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Banco Popular Branches |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net assets pre-acquisition |  |  |  | $ 24,027 us-gaap_AssetsNet / dei_LegalEntityAxis = banc_BancoPopularNorthAmericaMember

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