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Schedule II. Condensed Financial Information of Registrant - Condensed Statements of Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues      
Net investment income $ 25,435 $ 29,364 $ 32,483
Net unrealized gains on equity securities 12,315 4,204 4,758
Fee and other income 496 350 321
Total revenues 315,934 339,477 370,370
Expenses      
Total expenses 236,485 232,558 254,853
Income tax expense (benefit) 13,693 20,317 22,827
Net income 65,756 86,602 92,690
Parent Company [Member]      
Revenues      
Net investment income 896 944 915
Net unrealized gains on equity securities 2,590 (276) 1,977
Fee and other income 8,541 9,122 5,352
Total revenues 12,027 9,790 8,244
Expenses      
Other operating costs 8,541 9,122 8,244
Total expenses 8,541 9,122 8,244
Income before income taxes and equity in earnings of subsidiaries 3,486 668  
Income tax expense (benefit) (1,188) 259 376
Gain (loss) before equity in earnings of subsidiaries 4,674 409 (376)
Equity in net income of subsidiaries 61,083 86,193 93,066
Net income $ 65,757 $ 86,602 $ 92,690