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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues      
Net premiums earned $ 304,427 $ 332,888 $ 350,326
Net investment income 29,364 32,483 30,452
Net realized gains (losses) on investments 1,132 (80) (1,536)
Net unrealized gains (losses) on equity securities 4,204 4,758 (2,088)
Fee and other income 350 321 599
Total revenues 339,477 370,370 377,753
Expenses      
Loss and loss adjustment expenses incurred 157,226 176,342 204,891
Underwriting and certain other operating costs 20,834 22,221 28,981
Commissions 23,147 25,010 26,160
Salaries and benefits 27,925 27,120 25,992
Policyholder dividends 3,453 4,160 4,148
Provision for investment related credit loss benefit (27)    
Total expenses 232,558 254,853 290,172
Income before income taxes 106,919 115,517 87,581
Income tax expense 20,317 22,827 15,949
Net income $ 86,602 $ 92,690 $ 71,632
Earnings per share      
Basic $ 4.49 $ 4.82 $ 3.73
Diluted $ 4.47 $ 4.80 $ 3.71
Shares used in computing earnings per share      
Basic 19,288,996 19,248,657 19,208,978
Diluted 19,363,809 19,329,238 19,293,082
Extraordinary cash dividends declared per common share $ 3.50 $ 3.50 $ 3.50
Cash dividends declared per common share $ 1.08 $ 1.00 $ 0.88