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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Loan and Lease Losses (Details) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Delinquency period | 60 days
SBA |
Financing Receivable, Modifications [Line Items] |
Percentage of credit enhancement for loans up to $150,000 | 85.00%
Percentage of credit enhancement for loans greater than $150,000 | 75.00%

X
- Definition Number of days delinquent at which a loan or lease is individually analyzed. + References No definition available. + Details
Name: | banc_FinancingReceivableDaysDelinquentClassifiedasCreditRisk
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Balance Type: | na
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X
- Definition Loans and Leases Receivable, Percentage of Credit Enhancement For Loans Up To $150,000 + References No definition available. + Details
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Namespace Prefix: | banc_
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Balance Type: | na
Period Type: | duration

X
- Definition Loans and Leases Receivable, Percentage of Credit Enhancement for Loans Greater than $150,000 + References No definition available. + Details
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Namespace Prefix: | banc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
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