Regulatory Capital Requirements and Other Regulatory Matters (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Tier 1 Leverage Ratio
Actual, Amount (in dollars)	$ 2,179,494	$ 2,016,538
Actual, Ratio (as a percent)	0.1029	0.1008
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 847,230	$ 799,963
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)	$ 2,179,494	$ 2,016,538
Actual, Ratio (as a percent)	12.99%	12.11%
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,174,699	$ 1,165,837
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)	$ 2,179,494	$ 2,016,538
Actual, Ratio (as a percent)	0.1299	0.1211
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,426,420	$ 1,415,659
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)	$ 2,605,586	$ 2,434,680
Actual, Ratio (as a percent)	0.1553	0.1462
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,762,049	$ 1,748,755
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)	$ 2,499,418	$ 2,324,626
Actual, Ratio (as a percent)	0.1180	0.1162
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 847,354	$ 800,009
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)	$ 1,059,193	$ 1,000,012
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	0.0500	0.0500
Common Equity Tier 1 Capital Ratio
Actual, Amount (in dollars)	$ 2,499,418	$ 2,324,626
Actual, Ratio (as a percent)	14.89%	13.96%
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,174,963	$ 1,165,449
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)	$ 1,091,037	$ 1,082,202
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	6.50%	6.50%
Tier 1 Capital Ratio
Actual, Amount (in dollars)	$ 2,499,418	$ 2,324,626
Actual, Ratio (as a percent)	0.1489	0.1396
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,426,741	$ 1,415,188
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)	$ 1,342,815	$ 1,331,941
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	0.0800	0.0800
Total Capital Ratio
Actual, Amount (in dollars)	$ 2,642,306	$ 2,448,201
Actual, Ratio (as a percent)	0.1574	0.1470
Minimum Required for Capital Adequacy Purposes Inclusive of Capital Conservation Buffer, Amount (in dollars)	$ 1,762,444	$ 1,748,173
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)	$ 1,678,518	$ 1,664,927
Minimum Required For Well Capitalized Requirement, Ratio (as a percent)	0.1000	0.1000