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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Accrual Loans and Loans Past Due 90 Days Still on Accrual (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due 90 days or more and still accruing | $ 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing | $ 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
The Company maintains specific allowances for these loans of $80 in 2014 and $95 in 2013 | 42,754 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | 38,381 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Specific allowance on non accrual loans | 584 banc_FinancingReceivableRecordedInvestmentNonaccrualStatusAllowance | 478 banc_FinancingReceivableRecordedInvestmentNonaccrualStatusAllowance
Non-Traditional Mortgages (NTM) |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due 90 days or more and still accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember
The Company maintains specific allowances for these loans of $80 in 2014 and $95 in 2013 | 13,635 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember | 14,592 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember
Traditional Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due 90 days or more and still accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / banc_FinancingReceivablePortfolioSegmentAxis = banc_TraditionalLoansMember | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / banc_FinancingReceivablePortfolioSegmentAxis = banc_TraditionalLoansMember
The Company maintains specific allowances for these loans of $80 in 2014 and $95 in 2013 | $ 29,119 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / banc_FinancingReceivablePortfolioSegmentAxis = banc_TraditionalLoansMember | $ 23,789 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / banc_FinancingReceivablePortfolioSegmentAxis = banc_TraditionalLoansMember

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- Definition Financing Receivable, Recorded Investment, Nonaccrual Status, Allowance + References No definition available. + Details
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Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |