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Shareholders' Equity (Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
May 30, 2017
Shareholders Equity [Line Items]        
Capital shares authorized   50,210,000    
Common stock, shares authorized   50,000,000 50,000,000  
Preferred stock, shares authorized   210,000    
Preferred stock, par value   $ 100    
Preferred stock, shares issued   173,286 173,398  
Preferred stock, shares outstanding   173,286 173,398  
Common stock issued for "at-the-market" equity offering 1,363,964 1,363,964    
Shares issued weighted average price $ 29.33      
Proceeds from Issuance of common stock, gross $ 40,000,000      
Proceeds from issuance of common stock $ 38,300,000 $ 38,303,000    
Preferred Class A [Member]        
Shareholders Equity [Line Items]        
Preferred stock, shares authorized   10,000    
Series A 3% Preferred Stock [Member]        
Shareholders Equity [Line Items]        
Preferred stock, dividend percentage   3.00% 3.00%  
Preferred stock, shares issued   1,439 1,492  
Preferred stock, shares outstanding   1,439 1,492  
Preferred stock, dividend per share   $ 3.00    
Preferred Class B [Member]        
Shareholders Equity [Line Items]        
Preferred stock, shares authorized   200,000    
Series B-1 8.48% Preferred Stock [Member]        
Shareholders Equity [Line Items]        
Preferred stock, shares authorized   200,000 200,000  
Preferred stock, par value   $ 100 $ 100  
Preferred stock, dividend percentage   8.48% 8.48%  
Preferred stock, shares issued   171,847 171,906  
Preferred stock, shares outstanding   171,847 171,906  
Preferred stock, dividend per share   $ 8.48    
Maximum [Member]        
Shareholders Equity [Line Items]        
Common stock approved for issuance       $ 40,000,000