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Income Taxes (Summary of Differences Between the Statutory Federal Income Tax Rate and Effective Tax Rates) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]    
Federal income tax at statutory rate 21.00% 21.00%
Increase (decrease) in tax resulting from:    
State tax, net of federal tax benefit 6.00% 5.80%
Tax exempt income and dividends received deduction (0.40%) (0.60%)
Other 1.20% (0.10%)
Effective tax rate 27.80% 26.10%