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Employee Benefit Plans (Stock Option Plans) (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
stock_option_plan
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Mar. 31, 2010
shares
Mar. 31, 2009
shares
Postemployment Benefits [Abstract]          
Incentive and non-qualified stock option plans, number of plans | stock_option_plan 3        
Incentive and non-qualified stock option plans, number of shares authorized       150,000  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vested during period, shares 4,500 5,200 5,400    
Options vested during period, shares, weighted average exercise price | $ / shares $ 23.57 $ 23.50 $ 23.50    
Options outstanding and exercisable, instrinsic value | $ $ 0        
Compensation expense related to stock options | $ 8,000 $ 12,700 $ 12,700    
Unrecognized compensation cost related to non-vested stock options | $ $ 5,000        
Unrecognized compensation cost related to non-vested stock options, period for recognition 3 years        
Award annual vesting percentage 20.00%        
Award expiration period 10 years        
2008 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for the issuance 50,000        
2008 Equity Incentive Plan [Member] | Stock Options and SARS [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for the issuance         50,000
2008 Equity Incentive Plan [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for the issuance         50,000