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Goodwill and Other Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-lived Intangible Assets [Roll Forward]                      
Balance, beginning of year       $ 48,963us-gaap_FiniteLivedIntangibleAssetsGross       $ 45,412us-gaap_FiniteLivedIntangibleAssetsGross $ 48,963us-gaap_FiniteLivedIntangibleAssetsGross $ 45,412us-gaap_FiniteLivedIntangibleAssetsGross $ 67,100us-gaap_FiniteLivedIntangibleAssetsGross
Balance, beginning of year       (31,715)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization       (30,689)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (31,715)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (30,689)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (49,685)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Additions due to acquisitions                 6,720us-gaap_FinitelivedIntangibleAssetsAcquired1 7,927us-gaap_FinitelivedIntangibleAssetsAcquired1 4,924us-gaap_FinitelivedIntangibleAssetsAcquired1
Additions (7,381)us-gaap_AmortizationOfIntangibleAssets (5,193)us-gaap_AmortizationOfIntangibleAssets (86,242)us-gaap_AmortizationOfIntangibleAssets (2,200)us-gaap_AmortizationOfIntangibleAssets (16,673)us-gaap_AmortizationOfIntangibleAssets (5,450)us-gaap_AmortizationOfIntangibleAssets (17,997)us-gaap_AmortizationOfIntangibleAssets (692)us-gaap_AmortizationOfIntangibleAssets (6,268)us-gaap_AmortizationOfIntangibleAssets (5,402)us-gaap_AmortizationOfIntangibleAssets (6,326)us-gaap_AmortizationOfIntangibleAssets
Fully amortized portion                 (1,293)pacw_FiniteLivedIntangibleAssetsFullyAmortizedPortion (4,376)pacw_FiniteLivedIntangibleAssetsFullyAmortizedPortion (20,746)pacw_FiniteLivedIntangibleAssetsFullyAmortizedPortion
Write-off due to the asset financing segment reorganization                 (804)us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Removal due to branch sale                 0pacw_FiniteLivedIntangibleAssetsAccumulatedAmortizationRemovalDueToBranchSale 0pacw_FiniteLivedIntangibleAssetsAccumulatedAmortizationRemovalDueToBranchSale 4,576pacw_FiniteLivedIntangibleAssetsAccumulatedAmortizationRemovalDueToBranchSale
Balance, end of year 53,090us-gaap_FiniteLivedIntangibleAssetsGross       48,963us-gaap_FiniteLivedIntangibleAssetsGross       53,090us-gaap_FiniteLivedIntangibleAssetsGross 48,963us-gaap_FiniteLivedIntangibleAssetsGross 45,412us-gaap_FiniteLivedIntangibleAssetsGross
Net CDI and CRI, end of year 17,204us-gaap_FiniteLivedIntangibleAssetsNet       17,248us-gaap_FiniteLivedIntangibleAssetsNet       17,204us-gaap_FiniteLivedIntangibleAssetsNet 17,248us-gaap_FiniteLivedIntangibleAssetsNet 14,723us-gaap_FiniteLivedIntangibleAssetsNet
Net CDI and CRI, end of year (35,886)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization       (31,715)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization       (35,886)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (31,715)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (30,689)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
CDI and CRI [Member]                      
Finite-lived Intangible Assets [Roll Forward]                      
Fully amortized portion                 (1,293)pacw_FiniteLivedIntangibleAssetsFullyAmortizedPortion
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
(4,376)pacw_FiniteLivedIntangibleAssetsFullyAmortizedPortion
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
(20,746)pacw_FiniteLivedIntangibleAssetsFullyAmortizedPortion
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
Write-off due to the asset financing segment reorganization                 (1,300)us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
0us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
0us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
Removal due to branch sale                 $ 0pacw_FiniteLivedIntangibleAssetsRemovalDueToBranchSale
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
$ 0pacw_FiniteLivedIntangibleAssetsRemovalDueToBranchSale
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
$ 5,866pacw_FiniteLivedIntangibleAssetsRemovalDueToBranchSale
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember