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Benefit Plans Benefit Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Benefit Plans [Abstract] |  |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 4.00% |  |
Cost Recognized | $ 7.5 | $ 7.7 | $ 8.1

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- Definition Benefit Plans [Abstract] + References No definition available. + Details
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Namespace Prefix: | banc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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