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Federal Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Change in Net Deferred Federal Income Tax Assets $ 46,800  
Net loss reserve discounting 48,193 $ 43,285
Net unearned premiums 57,004 53,556
Employee benefits 10,646 8,862
Long-term incentive compensation plans 5,727 9,095
Temporary investment write-downs 1,059 1,155
Other 6,478 5,744
Total deferred tax assets 129,107 121,697
Deferred policy acquisition costs 56,949 53,049
Unrealized gains on investment securities 45,294 502
Other investment-related items, net 7,576 4,904
Accelerated depreciation and amortization 12,512 9,702
Total deferred tax liabilities 122,331 68,157
Deferred federal income tax 6,776 $ 53,540
Investments [Member]    
Change in Net Deferred Federal Income Tax Assets $ 44,800