Subordinated Debentures (Details) - USD ($)	1 Months Ended		9 Months Ended
	Aug. 31, 2014	Mar. 31, 2004	Sep. 30, 2017	Apr. 01, 2017
PPBI Trust I
Subordinated Debentures
Floating Rate Trust Preferred Securities issue amount		$ 10,000,000
Notes
Subordinated Debentures
Debt issued	$ 60,000,000
Fixed interest rate (as a percent)	5.75%
Contribution of net proceeds from the Private Placement to the Bank to support general corporate purposes	$ 50,000,000
Subordinated Debentures
Subordinated Debentures
Floating interest rate, base rate			three-month LIBOR
Effective rate (as a percent)			4.05%
Subordinated Debentures | Mission Community Capital Trust I
Subordinated Debentures
Effective rate (as a percent)			4.25%
Floating rate junior subordinated debt			$ 2,800,000	$ 3,100,000
Purchase accounting fair value adjustments			$ 332,000
Subordinated Debentures | Santa Lucia Bancorp (CA) Capital Trust
Subordinated Debentures
Effective rate (as a percent)			2.78%
Floating rate junior subordinated debt			$ 3,700,000	5,200,000
Purchase accounting fair value adjustments			$ 1,400,000
Subordinated Debentures | Heritage Oaks Bancorp
Subordinated Debentures
Effective rate (as a percent)			3.02%
Floating rate junior subordinated debt			$ 3,900,000	$ 5,200,000
Purchase accounting fair value adjustments			$ 1,300,000
Subordinated Debentures | LIBOR
Subordinated Debentures
Floating interest rate, basis points added to base rate (as a percent)			2.75%
Subordinated Debentures | LIBOR | Mission Community Capital Trust I
Subordinated Debentures
Floating interest rate, basis points added to base rate (as a percent)			2.95%
Subordinated Debentures | LIBOR | Santa Lucia Bancorp (CA) Capital Trust
Subordinated Debentures
Floating interest rate, basis points added to base rate (as a percent)			1.48%
Subordinated Debentures | LIBOR | Heritage Oaks Bancorp
Subordinated Debentures
Floating interest rate, basis points added to base rate (as a percent)			1.72%
Subordinated Debentures | PPBI Trust I
Subordinated Debentures
Debt issued		$ 10,300,000.0