Regulatory Capital Restrictions (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Regulatory Capital Restrictions [Line Items]
Retained earnings, unappropriated	$ 16,800,000
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	$ 154,200,000
Insurance agency management fee	3,000,000.0	$ 0
Statutory accounting practices, statutory capital and surplus, balance	211,600,000	254,700,000
Statutory accounting practices, statutory net income amount	(10,100,000)	10,200,000
Hallmark Insurance Company Subsidiaries [Member] | Scenario, Forecast [Member]
Regulatory Capital Restrictions [Line Items]
Aggregate amount of shareholder dividends, maximum available next current fiscal year			$ 22,500,000
Hallmark Insurance Company Subsidiaries [Member] | Hallmark (Payee) [Member]
Regulatory Capital Restrictions [Line Items]
Dividends paid by subsidiaries	$ 12,000,000.0	$ 15,500,000
Hallmark Insurance Company Subsidiaries [Member] | Hallmark (Payee) [Member] | Scenario, Forecast [Member]
Regulatory Capital Restrictions [Line Items]
Aggregate amount of shareholder dividends, maximum available next current fiscal year			$ 15,000,000.0