Basis of Presentation (Narrative) (Details) $ / shares in Units, $ in Thousands				3 Months Ended			6 Months Ended
	Jan. 01, 2023 $ / shares shares	Aug. 23, 2007 USD ($)	Jun. 21, 2005 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) $ / shares shares
Variable Interest Entity [Line Items]
Losses and loss adjustment expenses					$ 36,752	$ 72,646	$ 66,516	$ 112,028
Reinsurance recoverable, allowance for credit loss					200		200
Senior unsecured notes due 2029, carrying value					49,401		49,401		$ 49,352
Deferred tax, valuation allowance					41,400		41,400
Uncertain tax positions					$ 0		$ 0
Reverse stock split ratio	0.1
Common stock, par value | $ / shares	$ 1.00				$ 1.00		$ 1.00		$ 1.00
Common stock, authorized shares | shares	3,333,333				3,333,333		3,333,333		3,333,333
Fractional shares issued (in shares) | shares	0
Scenario, Forecast [Member] | Maui, Hawaii Wildfires [Member]
Variable Interest Entity [Line Items]
Losses and loss adjustment expenses				$ 7,500
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		$ 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		49,400
Senior unsecured notes due 2029, fair value					44,900		44,900
Subordinated Debt [Member]
Variable Interest Entity [Line Items]
Trust preferred securities, carrying value					56,000		56,000
Trust preferred securities, fair value					35,400		35,400
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
Discontinued Operations, Held-for-sale or disposed of by sale | E&S [Member]
Variable Interest Entity [Line Items]
Losses and loss adjustment expenses					$ (4,641)	$ 39,287	$ (4,987)	$ 63,929