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Revenue From Contracts With Customers Revenue From Contracts With Customers (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Revenue From Contracts With Customers [Abstract] |  |
Contract With Customer, Receivable Reclassified to Other Assets | $ 1,679 | $ 1,615
Contract with Customer, Asset, Reclassified to Receivable | 0 | 0
Contract With Customer, Liabilities Reclassified to Other Assets | $ 348 | $ 418

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- Definition Contract With Customer, Liabilities Reclassified to Other Assets + References No definition available. + Details
Name: | banc_ContractWithCustomerLiabilitiesReclassifiedtoOtherAssets
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract With Customer, Receivable Reclassified to Other Assets + References No definition available. + Details
Name: | banc_ContractWithCustomerReceivableReclassifiedtoOtherAssets
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Revenue From Contracts With Customers [Abstract] + References No definition available. + Details
Name: | banc_RevenueFromContractsWithCustomersAbstract
Namespace Prefix: | banc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 + Details
Name: | us-gaap_ContractWithCustomerAssetReclassifiedToReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration