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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (SIP) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares to be issued in stock incentive plan (in shares) 149,983      
Options, Grants in Period, Gross 0 0 0  
RSA/RSU, Grants in Period, Gross 18,391 13,912 18,002  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options, Grants in Period, Gross       59,500
Stock Unit Awards and Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSA/RSU, Grants in Period, Gross     18,002  
Stock Unit Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSA/RSU, Grants in Period, Gross 18,391 13,912