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Schedule II. Condensed Financial Information of Registrant - Condensed Statements of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues                      
Net investment income $ 8,035 $ 8,264 $ 8,169 $ 8,015 $ 8,056 $ 7,884 $ 7,303 $ 7,209 $ 32,483 $ 30,452 $ 29,281
Net unrealized gains (losses) on equity securities                 4,758 (2,088)  
Fee and other income                 321 599 418
Total revenues 91,939 91,488 91,753 95,190 94,669 93,529 95,380 94,175 370,370 377,753 375,208
Expenses                      
Total expenses                 254,853 290,172 292,968
Income tax expense (benefit)                 22,827 15,949 36,009
Net income $ 34,014 $ 21,386 $ 17,890 $ 19,400 $ 18,806 $ 19,701 $ 16,956 $ 16,169 92,690 71,632 46,231
Parent Company [Member]                      
Revenues                      
Net investment income                 915 1,089 679
Net unrealized gains (losses) on equity securities                 1,977 (948)  
Fee and other income                 5,352 7,389 6,890
Total revenues                 8,244 7,530 7,569
Expenses                      
Other operating costs                 8,244 7,530 7,569
Total expenses                 8,244 7,530 7,569
Income tax expense (benefit)                 376 (36) 125
Gain (loss) before equity in earnings of subsidiaries                 (376) 36 (125)
Equity in net income of subsidiaries                 93,066 71,596 46,356
Net income                 $ 92,690 $ 71,632 $ 46,231