Schedule II. Condensed Financial Information of Registrant - Condensed Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Net investment income	$ 27,223	$ 25,435	$ 29,364
Net unrealized gains (losses) on equity securities	(8,092)	12,315	4,204
Fee and other income	468	496	350
Total revenues	294,737	315,934	339,477
Expenses
Total expenses	227,091	236,485	232,558
Income tax expense (benefit)	12,044	13,693	20,317
Net income	55,602	65,756	86,602
Parent Company [Member]
Revenues
Net investment income	2,395	896	944
Net unrealized gains (losses) on equity securities	(490)	2,590	(276)
Fee and other income	9,533	8,541	9,122
Total revenues	11,438	12,027	9,790
Expenses
Other operating costs	9,533	8,541	9,122
Total expenses	9,533	8,541	9,122
Income before income taxes and equity in earnings of subsidiaries	1,905	3,486	668
Income tax expense (benefit)	714	(1,188)	259
Gain before equity in earnings of subsidiaries	1,191	4,674	409
Equity in net income of subsidiaries	54,411	61,083	86,193
Net income	$ 55,602	$ 65,757	$ 86,602