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Incentive Plans Incentive Plans: Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
plan
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2017
USD ($)
plan
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Jun. 30, 2017
shares
Dec. 31, 2013
shares
Dec. 31, 2010
shares
Dec. 31, 2006
shares
Dec. 31, 2003
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of share-based compensation plans | plan 2   2            
Share-based compensation expense | $ $ 258,000 $ 275,000 $ 524,000 $ 977,000          
Income tax benefit recognized for share-based compensation plans | $ $ 7,000 8,000 $ 20,000 179,000          
Treasury stock, Shares used to fund Equity Incentive Plans for restricted stock 10,501,839   10,501,839   10,235,313        
2013 Equity Incentive Plan [Member] | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan           300,000      
Annual limitation on awards granted to an individual under Equity Incentive Plan         60,000        
2013 Equity Incentive Plan [Member] | Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan           300,000      
Annual limitation on awards granted to an individual under Equity Incentive Plan         45,000        
Equity Incentive Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options granted, weighted average grant date fair value | $ / shares $ 0.00   $ 0.00            
Stock options, Exercised 5,750   27,250            
Stock options, Granted 0   0            
Stock options, Forfeitured 0   2,500            
Unrecognized share-based compensation expense, stock options | $ $ 700,000 $ 1,100,000 $ 700,000 $ 1,100,000          
Equity Incentive Plan [Member] | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Term used to calculate expected volatility     84 months            
Stock options, Exercised 5,750 22,750 27,250 23,750          
Stock options, Granted 0 6,000 0 26,000          
Stock options, Forfeitured 0 11,250 2,500 27,250          
Number of shares available for grant 147,500 138,000 147,500 138,000          
Share-based compensation cost not yet recognized, weighted average period for recognition (less than) 1 year 1 month 18 days 2 years              
Forfeiture rate for Equity Incentive Plans     20.00% 20.00%          
Equity Incentive Plan [Member] | Employee Stock Option [Member] | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period         5 years        
Maximum term for stock awards         10 years        
Equity Incentive Plan [Member] | Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares available for grant 267,750 271,750 267,750 271,750          
Share-based compensation cost not yet recognized, weighted average period for recognition (less than) 1 year 3 months 2 years 2 months              
Forfeiture rate for Equity Incentive Plans     20.00% 20.00%          
Restricted stock, Vesting and distribution 0 0 0 87,750          
Restricted stock, Forfeited 0 8,250 2,000 15,250          
Restricted stock, grants in period 0 3,000 0 18,000          
Unrecognized share-based compensation expense, restricted stock | $ $ 867,000 $ 1,300,000 $ 867,000 $ 1,300,000          
Equity Incentive Plan [Member] | Restricted Stock [Member] | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period         5 years        
2010 Equity Incentive Plan | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan             586,250    
Annual limitation on awards granted to an individual under Equity Incentive Plan         117,250        
2010 Equity Incentive Plan | Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan             288,750    
Annual limitation on awards granted to an individual under Equity Incentive Plan         43,312        
Treasury stock, Shares used to fund Equity Incentive Plans for restricted stock           300,000 288,750    
2006 Equity Incentive Plan | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan               365,000  
Annual limitation on awards granted to an individual under Equity Incentive Plan         73,000        
2006 Equity Incentive Plan | Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan               185,000  
Annual limitation on awards granted to an individual under Equity Incentive Plan         27,750        
Treasury stock, Shares used to fund Equity Incentive Plans for restricted stock               185,000  
Stock Option Plans [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options granted, weighted average grant date fair value | $ / shares     $ 0.00            
Stock options, Exercised     0            
Stock options, Granted     0            
Stock options, Forfeitured     50,000            
Unrecognized share-based compensation expense, stock options | $ $ 0   $ 0            
Stock Option Plans [Member] | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 0   0            
Term used to calculate expected volatility     84 months            
Stock options, Forfeitured     50,000 12,500          
Stock Option Plans [Member] | Employee Stock Option [Member] | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period     5 years            
Maximum term for stock awards     10 years            
2003 Stock Option Plan | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan                 352,500
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 0   0