Summary of Significant Accounting and Reporting Policies - Nature of Operations and Basis of Presentation (Details)	6 Months Ended
	Jun. 30, 2026 item
Summary of Significant Accounting and Reporting Policies
Number of primary business units	2
PCC
Summary of Significant Accounting and Reporting Policies
Ownership percentage	100.00%
Securities Holdings
Summary of Significant Accounting and Reporting Policies
Ownership percentage	100.00%
HTH Hillcrest Project LLC
Summary of Significant Accounting and Reporting Policies
Membership ownership percentage	100.00%
Hilltop Investments I, LLC
Summary of Significant Accounting and Reporting Policies
Membership ownership percentage	100.00%
PCC \| Plains Capital Bank
Summary of Significant Accounting and Reporting Policies
Ownership percentage	100.00%
PCC \| Hilltop Opportunity Partners LLC
Summary of Significant Accounting and Reporting Policies
Membership ownership percentage	100.00%
Plains Capital Bank \| Prime Lending
Summary of Significant Accounting and Reporting Policies
Ownership percentage	100.00%
Prime Lending \| Prime Lending Ventures Management LLC
Summary of Significant Accounting and Reporting Policies
Membership ownership percentage	100.00%
Hilltop Investments I, LLC \| Hillcrest Land LLC
Summary of Significant Accounting and Reporting Policies
Membership ownership percentage	50.00%