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v3.25.1

Fair Value Option (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Fair Value Disclosures [Abstract] |  |
Other Borrowings, Fair Value Disclosure | $ 117,196 | $ 118,838
Borrowings - Credit-Link Notes | 118,100 |
Aggregate Unpaid Principal Balance in Excess of (Less Than) Fair Value | $ 929 | $ 301

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- Definition Aggregate Unpaid Principal Balance in Excess of (Less Than) Fair Value + References No definition available. + Details
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Namespace Prefix: | pacw_
Data Type: | xbrli:monetaryItemType
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- Definition Borrowings - Credit-Link Notes + References No definition available. + Details
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Namespace Prefix: | pacw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Other Borrowings, Fair Value Disclosure + References No definition available. + Details
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Namespace Prefix: | pacw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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