Regulatory Capital Requirements and Other Regulatory Matters (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Tier 1 Leverage Ratio
Actual, Amount (in dollars)	$ 2,084,189	$ 2,179,494
Actual, Ratio (as a percent)	0.1103	0.1029
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 755,610	$ 847,230
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)	$ 2,084,189	$ 2,179,494
Actual, Ratio (as a percent)	14.32%	12.99%
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,018,854	$ 1,174,699
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)	$ 2,084,189	$ 2,179,494
Actual, Ratio (as a percent)	0.1432	0.1299
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,237,180	$ 1,426,420
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)	$ 2,516,538	$ 2,605,586
Actual, Ratio (as a percent)	0.1729	0.1553
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,528,281	$ 1,762,049
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)	$ 2,347,494	$ 2,499,418
Actual, Ratio (as a percent)	0.1243	0.1180
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 755,724	$ 847,354
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)	$ 944,654	$ 1,059,193
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	0.0500	0.0500
Common Equity Tier 1 Capital Ratio
Actual, Amount (in dollars)	$ 2,347,494	$ 2,499,418
Actual, Ratio (as a percent)	16.13%	14.89%
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,018,964	$ 1,174,963
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)	$ 946,181	$ 1,091,037
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	6.50%	6.50%
Tier 1 Capital Ratio
Actual, Amount (in dollars)	$ 2,347,494	$ 2,499,418
Actual, Ratio (as a percent)	0.1613	0.1489
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,237,313	$ 1,426,741
Tier One Risk Based Capital Required for Capital Adequacy with Buffer to Risk Weighted Assets (as a a percent)	0.0850	0.0850
Minimum Required for Well Capitalized Requirement, Amount (in dollars)	$ 1,164,530	$ 1,342,815
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	0.0800	0.0800
Total Capital Ratio
Actual, Amount (in dollars)	$ 2,507,912	$ 2,642,306
Actual, Ratio (as a percent)	0.1723	0.1574
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,528,446	$ 1,762,444
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)	$ 1,455,662	$ 1,678,518
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	0.1000	0.1000