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Related Party Transactions (Split Dollar Agreements) (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Chairman, Board of Directors [Member]      
Related Party Transaction [Line Items]      
Payments for life insurance policies $ 0 $ 0  
Chief Executive Officer [Member]      
Related Party Transaction [Line Items]      
Payments for life insurance policies 0 $ 0  
Executive Officers [Member] | Other Long-Term Assets [Member]      
Related Party Transaction [Line Items]      
Life insurance assets, carrying amount $ 18,500,000   $ 18,500,000