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RELATED-PARTY TRANSACTIONS - Legal Fees and Other Matters (Details) - Entity Affiliated With Former President And Chief Executive Officer $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 letter_of_credit
Legal Fees And Credit |  |  |
Related Party Transaction [Line Items] |  |  |
Legal services period (more than four months) |  |  | 4 months
Expenses from transactions with related parties | $ 330 | $ 0 |
Number of letters of credit outstanding | letter_of_credit |  |  | 3
Reimbursement Of Legal Dispute |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties | $ 100 |  |

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- Definition Loans And Leases Receivable, Number Of Letters Of Credit Outstanding, Related Party + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Related Party Transaction, Legal Services, Period + References No definition available. + Details
Name: | banc_RelatedPartyTransactionLegalServicesPeriod
Namespace Prefix: | banc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Balance Type: | debit
Period Type: | duration

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