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Quarterly Financial Data (Unaudited) - Unaudited Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ 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
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                          
Net premiums earned $ 82,277 $ 82,712 $ 82,951 $ 84,948 $ 88,837 $ 85,184 $ 88,995 $ 87,310 $ 332,888 $ 350,326 $ 346,156    
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 realized gains (losses) on investments (53) (4) (82) 59 (65) (329) (1,111) (31) (80) (1,536) (647)    
Total revenues 91,939 91,488 91,753 95,190 94,669 93,529 95,380 94,175 370,370 377,753 375,208    
Income before income taxes 42,926 26,613 22,169 23,809 22,777 24,460 20,930 19,414 115,517 87,581 82,240    
Net income $ 34,014 $ 21,386 $ 17,890 $ 19,400 $ 18,806 $ 19,701 $ 16,956 $ 16,169 $ 92,690 $ 71,632 $ 46,231    
Earnings per share:                          
Basic $ 1.77 $ 1.11 $ 0.93 $ 1.01 $ 0.98 $ 1.03 $ 0.88 $ 0.84 $ 4.82 $ 3.73 $ 2.41    
Diluted $ 1.76 $ 1.11 $ 0.93 $ 1.01 $ 0.98 $ 1.02 $ 0.88 $ 0.84 $ 4.80 $ 3.71 $ 2.40    
Comprehensive income $ 33,610 $ 23,862 $ 23,068 $ 25,193         $ 105,733 $ 67,389 $ 50,335    
Comprehensive income         $ 22,176 $ 17,582 $ 17,109 $ 10,321          
Extraordinary cash dividends declared per common share $ 3.50       $ 3.50       $ 3.50 $ 3.50 $ 3.50 $ 3.25 $ 3.00
Cash dividends declared per common share $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.22 $ 0.22 $ 0.22 $ 0.22 $ 1.00 $ 0.88 $ 0.80