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, 2021			25,082,104
Beginning balance 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
Ending balance at Mar. 31, 2022		$ 835,625	$ 25	204,006	645,966	(14,372)
Balance, beginning (in shares) at Dec. 31, 2022		25,210,541	25,210,541
Beginning balance at Dec. 31, 2022		$ 740,114	$ 25	207,030	620,555	(87,496)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		694			694
Stock based compensation (in shares)			21,012
Stock based compensation		980		980
Dividends on common stock		(4,037)			(4,037)
Change in net unrealized investment appreciation (depreciation)	[3]	14,650				14,650
Change in liability for underfunded employee benefit plans	[4]	$ (607)				(607)
Balance, ending (in shares) at Mar. 31, 2023		25,231,553	25,231,553
Ending balance at Mar. 31, 2023		$ 751,795	$ 25	$ 208,010	$ 617,213	$ (73,453)

[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.

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

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