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Venture Capital Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modified, Accumulated	us-gaap_FinancingReceivableModificationsRecordedInvestment	$ 613,000
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.00%
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification	11 months
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction [Member] | Interest Only [Member]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification	11 months
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member] | Term Extension and Payment Delay [Member]
Financing Receivable, Modified, Accumulated	us-gaap_FinancingReceivableModificationsRecordedInvestment	$ 613,000
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.00%
Other Commercial [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modified, Accumulated	us-gaap_FinancingReceivableModificationsRecordedInvestment	$ 2,102,000
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.20%
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.10%
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 2,827,000
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Payment Delay [Member]
Financing Receivable, Modified, Accumulated	us-gaap_FinancingReceivableModificationsRecordedInvestment	$ 45,000
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.00%
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Term Extension and Interest Rate Reduction [Member]
Financing Receivable, Modified, Accumulated	us-gaap_FinancingReceivableModificationsRecordedInvestment	$ 0
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.00%
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification	3 months
Financing Receivable, Modified, Weighted Average Term Increase from Modification	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification	12 months
Financing Receivable, Modified, Accumulated	us-gaap_FinancingReceivableModificationsRecordedInvestment	$ 2,057,000
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.20%

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- Definition

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+ References

No definition available.

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- Definition

Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class

+ References

No definition available.

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- Definition

Accumulated amortized cost of financing receivable modified for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
-Paragraph 4
-Publisher FASB
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
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-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A

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