XML 59 R48.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Business Combinations and Asset Acquisitions (Details) shares in Thousands | Nov. 30, 2023 shares
--- | ---
Banc of California |
Business Combination and Asset Acquisition [Abstract] |
Shares, Outstanding | 57,000
Asset Acquisition [Line Items] |
Shares, Outstanding | 57,000
Pacific Western Bank |
Business Combination and Asset Acquisition [Abstract] |
Shares, Outstanding | 120,000
Asset Acquisition [Line Items] |
Shares, Outstanding | 120,000

X
- 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 15 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480123/805-50-15-3 + Details
Name: | us-gaap_AssetAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_BusinessCombinationAndAssetAcquisitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued which are neither cancelled nor held in the treasury. + References No definition available. + Details
Name: | us-gaap_SharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=pacw_BancOfCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=pacw_PacificWesternBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |