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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans and Leases (Details) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Threshold period past due for nonperforming status of financing receivables | 90 days
Threshold period past due for write-off of financing receivable | 180 days

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- Definition Threshold Period Past Due for Nonperforming Status of Financing Receivables + References No definition available. + Details
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Namespace Prefix: | banc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition Threshold period past due for financing receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_ThresholdPeriodPastDueForWriteoffOfFinancingReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration