Schedule II - Condensed Statement of Income (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Interest and dividends	$ 3,773	$ 4,393
Net realized investment gains (losses)	1,869	333
Changes in the estimated fair value of equity security investments	14,934	4,904
Net gain on disposals of property	3,957	26
Other	4,772	623
Total Revenues	329,498	236,408
Personnel expenses	64,193	51,929
Office and technology expenses	13,059	9,951
Other expenses	18,813	12,856
Operating Expenses	244,566	186,747
Income before Income Taxes	84,932	49,661
Provision (Benefit) for Income Taxes	17,912	10,241
Net income	$ 67,020	$ 39,420
Basic Earnings per Common Share	$ 35.38	$ 20.84
Weighted Average Shares Outstanding – Basic	1,894	1,892
Diluted Earnings per Common Share	$ 35.28	$ 20.80
Weighted Average Shares Outstanding – Diluted	1,900	1,896
Parent Company
Condensed Financial Statements, Captions [Line Items]
Interest and dividends	$ 376	$ 768
Net realized investment gains (losses)	1,050	(473)
Changes in the estimated fair value of equity security investments	1,182	265
Rental income	734	702
Net gain on disposals of property	3,937	0
Other	2,015	392
Total Revenues	9,294	1,654
Personnel expenses	1,039	908
Office and technology expenses	407	360
Other expenses	882	1,003
Operating Expenses	2,328	2,271
Equity in Net Income of Affiliated Companies	61,372	39,685
Income before Income Taxes	68,338	39,068
Provision (Benefit) for Income Taxes	1,318	(352)
Net income	$ 67,020	$ 39,420
Basic Earnings per Common Share	$ 35.38	$ 20.84
Weighted Average Shares Outstanding – Basic	1,894	1,892
Diluted Earnings per Common Share	$ 35.28	$ 20.80
Weighted Average Shares Outstanding – Diluted	1,900	1,896