Regulatory Capital Restrictions (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Y	Dec. 31, 2021 USD ($)
Regulatory Capital Restrictions [Line Items]
Number of financial year projections | Y	4
Minimum [Member]
Regulatory Capital Restrictions [Line Items]
Percentage of risk based capital level combined ratio	120.00%
American Hallmark Insurance Company and Texas Builders Insurance Company [Member]
Regulatory Capital Restrictions [Line Items]
Statutory Accounting Practices, Future Dividend Payments Restrictions	greater of statutory net income for the prior calendar year or 10% of statutory policyholders’ surplus as of the prior year end
Hallmark Insurance Company And Hallmark National Insurance Company [Member]
Regulatory Capital Restrictions [Line Items]
Statutory Accounting Practices, Future Dividend Payments Restrictions	lesser of 10% of prior year policyholders’ surplus or prior year’s net income
Hallmark Specialty Insurance Company [Member]
Regulatory Capital Restrictions [Line Items]
Statutory Accounting Practices, Future Dividend Payments Restrictions	greater of 10% of prior year policyholders’ surplus or prior year’s statutory net income, not including realized capital gains
Hallmark Insurance Company Subsidiaries [Member]
Regulatory Capital Restrictions [Line Items]
Amount of restricted net assets for consolidated and unconsolidated subsidiaries	$ 110.0
Insurance agency management fee	11.0	$ 15.5
Statutory accounting practices, statutory capital and surplus, balance	171.0	232.3
Statutory accounting practices, statutory net income (loss) amount	83.2	22.0
Hallmark Insurance Company Subsidiaries [Member] | Hallmark (Payee) [Member]
Regulatory Capital Restrictions [Line Items]
Dividends paid by subsidiaries	$ 6.0	$ 3.0