Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands		Total	Common Stock	Additional paid-in capital	Retaining Earnings	Accumulated other comprehensive income
Balance, beginning (in shares) at Dec. 31, 2020			25,055,479
Balance, beginning of year at Dec. 31, 2020		$ 825,149	$ 25	$ 202,359	$ 555,854	$ 66,911
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		18,702			18,702
Shares repurchased (in shares)			(207)
Shares repurchased		(7)		(7)
Stock based compensation (in shares)			64,583
Stock based compensation		522		522
Dividends on common stock		(3,767)			(3,767)
Change in net unrealized investment appreciation (depreciation)	[1]	(23,456)				(23,456)
Change in liability for underfunded employee benefit plans	[2]	6,456				6,456
Balance, ending (in shares) at Mar. 31, 2021			25,119,855
Balance, ending of year at Mar. 31, 2021		$ 823,599	$ 25	202,874	570,789	49,911
Balance, beginning (in shares) at Dec. 31, 2021		25,082,104	25,082,104
Balance, beginning of year at Dec. 31, 2021		$ 879,121	$ 25	203,375	621,384	54,337
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		28,349			28,349
Stock based compensation (in shares)			37,140
Stock based compensation		631		631
Dividends on common stock		(3,767)			(3,767)
Change in net unrealized investment appreciation (depreciation)	[1]	(65,793)				(65,793)
Change in liability for underfunded employee benefit plans	[2]	$ (2,916)				(2,916)
Balance, ending (in shares) at Mar. 31, 2022		25,119,244	25,119,244
Balance, ending of year at Mar. 31, 2022		$ 835,625	$ 25	$ 204,006	$ 645,966	$ (14,372)

[1] The change in net unrealized appreciation (depreciation) is net of reclassification adjustments and income taxes.

[2] The change in liability for underfunded employee benefit plans is net of reclassification adjustments and income taxes.