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Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 612,000
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member] | Term Extension and Payment Delay [Member] | Six Months Ended [Member]
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.00%
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 612,000
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member] | Extended Maturity [Member] | Six Months Ended [Member]
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Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 0
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member] | Payment Delay [Member] | Six Months Ended [Member]
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Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 0
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member] | Term Extension and Interest Rate Reduction [Member] | Six Months Ended [Member]
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Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 0
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction [Member] | Six Months Ended [Member]
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Venture Capital Loans [Member] | Commercial Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction [Member] | Interest Only [Member] | Six Months Ended [Member]
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Other Commercial [Member] | Commercial Portfolio Segment [Member]
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Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 2,153,000
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Other Commercial [Member] | Commercial Portfolio Segment [Member] | Six Months Ended [Member]
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.10%
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.30%
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 2,153,000
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 2,806,000
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Term Extension and Payment Delay [Member] | Six Months Ended [Member]
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.00%
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 0
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Combination - Term Extension and Principal Forgiveness [Member]
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Other Commercial [Member] | Commercial Portfolio Segment [Member] | Combination - Term Extension and Principal Forgiveness [Member] | Six Months Ended [Member]
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Other Commercial [Member] | Commercial Portfolio Segment [Member] | Combination Term Extension and Payment Delay [Member]
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Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 54,000
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Financing Receivable, Modified, Payment Delay	pacw_FinancingReceivableModifiedPaymentDelay	4 months
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Combination Term Extension and Payment Delay [Member] | Six Months Ended [Member]
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.00%
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 54,000
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Financing Receivable, Modified, Payment Delay	pacw_FinancingReceivableModifiedPaymentDelay	4 months
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, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.10%
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 931,000
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 2,099,000
Financing Receivable, Modified, Weighted Average Term Increase from Modification	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification	11 months
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Extended Maturity [Member] | Six Months Ended [Member]
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.10%
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.30%
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 2,099,000
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 2,762,000
Financing Receivable, Modified, Weighted Average Term Increase from Modification	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification	11 months
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Payment Delay [Member]
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.00%
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 0
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Payment Delay [Member] | Six Months Ended [Member]
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.00%
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.00%
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 44,000
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 0
Financing Receivable, Modified, Payment Delay	pacw_FinancingReceivableModifiedPaymentDelay	6 months
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Term Extension and Interest Rate Reduction [Member] | Six Months Ended [Member]
Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class	pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass	0.00%
Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance	pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance	$ 0
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification	23 months
Other Commercial [Member] | Commercial Portfolio Segment [Member] | Extended Maturity [Member] | Six Months Ended [Member]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification	16 months

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-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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