Regulatory Capital Restrictions (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Regulatory Capital Restrictions [Line Items]
Retained earnings, unappropriated	$ 19.8
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]
Aggregate amount of shareholder dividends, maximum available next current fiscal year	$ 32.0
Amount of restricted net assets for consolidated and unconsolidated subsidiaries	155.8
Insurance agency management fee	15.5	$ 4.2
Statutory accounting practices, statutory capital and surplus, balance	232.3	211.6
Statutory accounting practices, statutory net income (loss) amount	22.0	(10.1)
Hallmark Insurance Company Subsidiaries [Member] | Hallmark (Payee) [Member]
Regulatory Capital Restrictions [Line Items]
Aggregate amount of shareholder dividends, maximum available next current fiscal year	22.7
Dividends paid by subsidiaries	$ 3.0	$ 12.0