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BUSINESS COMBINATIONS - Narrative (Details) (USD $) | 0 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 08, 2014 | Dec. 31, 2014 | Mar. 31, 2015 | Jan. 31, 2014
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 31,591,000 us-gaap_Goodwill | $ 31,591,000 us-gaap_Goodwill |
Banco Popular Branches |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches | 20 banc_BusinessCombinationNumberofBranches / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Payments to acquire businesses, deposit premiums received | 3,900,000 banc_PaymentstoAcquireBusinessesDepositPremiumsReceived / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Payments to acquire businesses, net of deposit premiums received | 24,000,000 banc_PaymentstoAcquireBusinessesNetofDepositPremiumsReceived / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Loans and leases receivable | 1,072,449,000 banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLoansandLeasesReceivable / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Deposit liabilities | 1,076,614,000 banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDepositLiabilities / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Other intangible assets | 15,777,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Direct acquisition costs |  | 4,300,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |
Goodwill | 0 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |  |  |
Banco Popular Branches | Core deposit intangibles |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Other intangible assets | 15,777,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |  |  |
Amortization period of other intangible assets | 10 years |  |  |
Renovation Ready |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Loans and leases receivable |  |  |  | 0 banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLoansandLeasesReceivable / us-gaap_BusinessAcquisitionAxis = banc_RenovationReadyMember
Deposit liabilities |  |  |  | 0 banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDepositLiabilities / us-gaap_BusinessAcquisitionAxis = banc_RenovationReadyMember
Other intangible assets |  |  |  | 761,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = banc_RenovationReadyMember
Goodwill |  |  |  | $ 2,239,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = banc_RenovationReadyMember

X
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed Deposit Liabilities + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans and Leases Receivable + References No definition available. + Details
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Namespace Prefix: | banc_
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- Definition Payments to Acquire Businesses, Deposit Premiums Received + References No definition available. + Details
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Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Payments to Acquire Businesses, Net of Deposit Premiums Received + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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