Basis of Presentation (Narrative) (Details) $ / shares in Units, $ in Thousands				9 Months Ended
	Jan. 01, 2023 $ / shares shares	Aug. 23, 2007 USD ($)	Jun. 21, 2005 USD ($)	Sep. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Variable Interest Entity [Line Items]
Reinsurance recoverable, allowance for credit loss				$ 200
Senior unsecured notes due 2029, carrying value				49,426	$ 49,352
Deferred tax, valuation allowance				46,400
Uncertain tax positions				$ 0
Reverse stock split ratio	0.1
Common stock, par value | $ / shares	$ 1.00			$ 1.00	$ 1.00
Common stock, authorized shares | shares	3,333,333			3,333,333	3,333,333
Fractional shares issued (in shares) | shares	0
AM Best, A- Rating [Member]
Variable Interest Entity [Line Items]
Percentage of reinsurance recoverable				95.00%
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Variable Interest Entity [Line Items]
Reinsurance recoverable, allowance for credit loss				$ 200
Related Party [Member] | Hallmark Statutory Trust I [Member]
Variable Interest Entity [Line Items]
Proceeds from issuance of trust preferred securities			$ 30,000
Related Party [Member] | Hallmark Statutory Trust I I [Member]
Variable Interest Entity [Line Items]
Proceeds from issuance of trust preferred securities		$ 25,000
Senior unsecured notes due 2029 [Member]
Variable Interest Entity [Line Items]
Senior unsecured notes due 2029, carrying value				49,400
Senior unsecured notes due 2029, fair value				44,200
Subordinated Debt [Member]
Variable Interest Entity [Line Items]
Trust preferred securities, carrying value				56,000
Trust preferred securities, fair value				$ 39,100
Subordinated Debt [Member] | Related Party [Member] | Hallmark Statutory Trust I [Member]
Variable Interest Entity [Line Items]
Payments to acquire trust preferred investments			$ 30,900
Subordinated Debt [Member] | Related Party [Member] | Hallmark Statutory Trust I I [Member]
Variable Interest Entity [Line Items]
Payments to acquire trust preferred investments		$ 25,800