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Employee Benefit Plans (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, stock dividend, percentage     10.00% 10.00%  
Defined contribution plan, maximum annual contributions per employee, percent 80.00%        
Employer, contribution $ 601,000 $ 492,000 $ 388,000    
Deferred fees 297,000 149,000 120,000    
Interest paid on deferred fees 67,000 44,000 34,000    
Deferred compensation arrangement with individual, distributions paid $ 14,000 $ 8,000 $ 0    
Award vesting period 3 years        
Award expiration period 10 years        
Number of shares authorized (in shares) 2,462,585        
Options outstanding (in shares) 584,178 504,573 552,759   522,338
Options exercised, forfeited or expired (in shares) 1,691,602        
Number of shares available for grant (in shares) 186,805        
Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred compensation arrangement, option to elect to defer fees and bonuses, percentage 100.00%        
Executive Management          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred compensation arrangement, option to elect to defer fees and bonuses, percentage 100.00%        
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost not yet recognized $ 1,100,000        
Compensation cost not yet recognized, weighted average period 2 years 4 months 24 days        
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 4 years        
Number of shares authorized (in shares) 518,157        
Number of shares available for grant (in shares) 65,478        
Compensation cost not yet recognized $ 1,300,000        
Compensation cost not yet recognized, weighted average period 2 years 9 months 18 days        
Other Postretirement Benefits Plan | Executive Management          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Life settlement contracts, fair value $ 250,000        
Life settlement contracts, expense $ 18,000 $ 5,000 $ 5,000