Summary of Significant Accounting and Reporting Policies - Nature of Operations and Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2025 item
Basis of Presentation
Number of primary business units	2
PCC
Basis of Presentation
Ownership percentage	100.00%
Securities Holdings
Basis of Presentation
Ownership percentage	100.00%
HTH Hillcrest Project LLC
Basis of Presentation
Membership ownership percentage	100.00%
Hilltop Investments I, LLC
Basis of Presentation
Membership ownership percentage	100.00%
PCC | Plains Capital Bank
Basis of Presentation
Ownership percentage	100.00%
PCC | Hilltop Opportunity Partners LLC
Basis of Presentation
Membership ownership percentage	100.00%
Plains Capital Bank | Prime Lending
Basis of Presentation
Ownership percentage	100.00%
Prime Lending | Prime Lending Ventures Management LLC
Basis of Presentation
Membership ownership percentage	100.00%
Hilltop Investments I, LLC | Hillcrest Land LLC
Basis of Presentation
Membership ownership percentage	50.00%