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Incentive Plans Incentive Plans: Narrative (Details)
3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
plan
$ / shares
shares
Sep. 30, 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            
Share-based compensation expense | $ $ 266,000 $ 702,000          
Income tax benefit recognized for share-based compensation plans | $ $ 27,000 187,000          
Treasury stock, Shares used to fund Equity Incentive Plans for restricted stock 10,361,313   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            
Stock options, Exercised 21,500            
Stock options, Granted 0            
Stock options, Forfeitured 2,500            
Unrecognized share-based compensation expense, stock options | $ $ 800,000 $ 1,300,000          
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 21,500 15,000          
Stock options, Granted 0 20,000          
Stock options, Forfeitured 2,500 16,000          
Number of shares available for grant 147,500 131,750          
Share-based compensation cost not yet recognized, weighted average period for recognition (less than) 1 year 3 months 18 days 2 years 1 month 24 days          
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 267,750 268,850          
Share-based compensation cost not yet recognized, weighted average period for recognition (less than) 1 year 6 months 2 years 3 months          
Forfeiture rate for Equity Incentive Plans 20.00% 20.00%          
Restricted stock, Vesting and distribution 0 87,750          
Restricted stock, Forfeited 2,000 7,000          
Restricted stock, grants in period 0 15,000          
Unrecognized share-based compensation expense, restricted stock | $ $ 1,000,000 $ 1,800,000          
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            
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            
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