Regulatory Capital Requirements and Other Regulatory Matters (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Tier 1 Leverage Ratio
Actual, Amount (in dollars)	$ 2,016,538	$ 1,811,280
Actual, Ratio (as a percent)	0.1008	0.0947
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 799,963	$ 764,968
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Ratio (as a percent)	0.0400	0.0400
Common Equity Tier 1 Capital Ratio
Actual, Amount (in dollars)	$ 2,016,538	$ 1,811,280
Actual, Ratio (as a percent)	12.11%	12.04%
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,165,837	$ 1,053,063
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Ratio (as a percent)	0.0700	0.0700
Tier 1 Capital Ratio
Actual, Amount (in dollars)	$ 2,016,538	$ 1,811,280
Actual, Ratio (as a percent)	0.1211	0.1204
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,415,659	$ 1,278,719
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Ratio (as a percent)	0.0850	0.0850
Total Capital Ratio
Actual, Amount (in dollars)	$ 2,434,680	$ 2,454,055
Actual, Ratio (as a percent)	0.1462	0.1631
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,748,755	$ 1,579,594
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Ratio (as a percent)	0.1050	0.1050
Pacific Premier Bank
Tier 1 Leverage Ratio
Actual, Amount (in dollars)	$ 2,324,626	$ 2,081,916
Actual, Ratio (as a percent)	0.1162	0.1089
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 800,009	$ 764,863
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Ratio (as a percent)	0.0400	0.0400
Minimum Required For Well Capitalized Requirement, Amount (in dollars)	$ 1,000,012	$ 956,079
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	0.0500	0.0500
Common Equity Tier 1 Capital Ratio
Actual, Amount (in dollars)	$ 2,324,626	$ 2,081,916
Actual, Ratio (as a percent)	13.96%	13.84%
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,165,449	$ 1,053,177
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Ratio (as a percent)	0.0700	0.0700
Minimum Required For Well Capitalized Requirement, Amount (in dollars)	$ 1,082,202	$ 977,950
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	6.50%	6.50%
Tier 1 Capital Ratio
Actual, Amount (in dollars)	$ 2,324,626	$ 2,081,916
Actual, Ratio (as a percent)	0.1396	0.1384
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,415,188	$ 1,278,858
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Ratio (as a percent)	0.0850	0.0850
Minimum Required For Well Capitalized Requirement, Amount (in dollars)	$ 1,331,941	$ 1,203,631
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	0.0800	0.0800
Total Capital Ratio
Actual, Amount (in dollars)	$ 2,448,201	$ 2,390,954
Actual, Ratio (as a percent)	0.1470	0.1589
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,748,173	$ 1,579,766
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Ratio (as a percent)	0.1050	0.1050
Minimum Required For Well Capitalized Requirement, Amount (in dollars)	$ 1,664,927	$ 1,504,539
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	0.1000	0.1000