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Related Party Transactions (Split Dollar Agreements) (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Chairman, Board of Directors [Member]          
Related Party Transaction [Line Items]          
Payments for life insurance policies $ 600,000 $ 600,000 $ 1,100,000 $ 1,100,000  
Chief Executive Officer [Member]          
Related Party Transaction [Line Items]          
Payments for life insurance policies 0 $ 0 700,000 $ 700,000  
Executive Officers [Member] | Other Long-Term Assets [Member]          
Related Party Transaction [Line Items]          
Life insurance assets, carrying amount $ 18,500,000   $ 18,500,000   $ 16,600,000