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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues                      
Net investment income $ 8,056 $ 7,884 $ 7,303 $ 7,209 $ 7,312 $ 7,788 $ 7,471 $ 6,710 $ 30,452 $ 29,281 $ 28,106
Net unrealized losses on equity securities                 (2,088)    
Fee and other income                 599 418 346
Total revenues 94,669 93,529 95,380 94,175 94,937 92,804 89,925 97,542 377,753 375,208 396,662
Expenses                      
Total expenses                 290,172 292,968 283,841
Income tax expense (benefit)                 15,949 36,009 34,956
Net income $ 18,806 $ 19,701 $ 16,956 $ 16,169 $ 649 $ 16,577 $ 15,481 $ 13,524 71,632 46,231 77,865
Parent Company [Member]                      
Revenues                      
Net investment income                 1,089 679 1,509
Net unrealized losses on equity securities                 (948)    
Fee and other income                 7,389 6,890 5,843
Total revenues                 7,530 7,569 7,352
Expenses                      
Other operating costs                 7,530 7,569 7,352
Total expenses                 7,530 7,569 7,352
Income tax expense (benefit)                 (36) 125 (156)
Gain (loss) before equity in earnings of subsidiaries                 36 (125) 156
Equity in net income of subsidiaries                 71,596 46,356 77,709
Net income                 $ 71,632 $ 46,231 $ 77,865