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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
   December 31, 
    2014  2013  2012 
 Stock options$663 $517 $542 
 Nonvested stock awards and restricted stock units 2,473  1,900  1,504 
 Employee stock purchase plan 73  60  48 
 Non-elective and elective 401(k) matching contribution in stock 1,975  1,612  1,653 
 Director stock ownership plan 125  72  60 
 Total share-based compensation expense$5,309 $4,161 $3,807 
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
  2014 2013
    Weighted   Weighted   Weighted  Weighted
    Average  Average   Average Average
    Exercise   Remaining   Exercise  Remaining
  Number of Price   Contractual Number of Price  Contractual
  Shares per Share  Term (years) Shares per Share Term (years)
Options outstanding at January 1,75,251 $44.49    107,455 $31.23  
 Options granted37,048  73.47    29,302  58.26  
 Options exercised(25,224)  36.65    (57,137)  27.12  
 Options forfeited0  0.00    (3,601)  37.81  
 Options expired0  0.00    (768)  37.37  
Options outstanding at December 31, 87,075 $59.09  5.2 75,251 $44.49 5.2
Options exercisable at December 31, 18,696 $44.38  4.1 11,840 $28.42 3.9
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
        Number Weighted Weighted Number Weighted 
        Outstanding  Average Average Exercisable Average 
 Range ofat Contractual Exercise at Exercise 
 Exercise Prices12/31/2014 Life Price 12/31/2014 Price 
 $0.00 - $10.000 0 $0 0 $0 
 $10.01 - $20.002,367 2.1  18.82 2,367  18.82 
 $20.01 - $30.000 0  0 0  0 
 $30.01 - $40.0018,296 4.0  37.96 7,230  37.71 
 $40.01 - $50.002,192 4.5  46.21 1,462  46.21 
 $50.01 - $60.0027,172 5.2  58.26 7,637  58.26 
 $60.01 - $70.000 0  0 0  0 
 $70.01 - $80.0037,048 6.2  73.47 0  0 
        87,075 5.2  59.09 18,696  44.38 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   For the Year Ended December 31, June 30,  
   2014  2013  2012  2011  2012  
 Number of stock options granted 37,048  29,302  37,965  36,835  2,192  
 Dividend yield 2.00% 2.49% 3.09% 5.00% 2.69% 
 Expected volatility 43.34% 57.28% 69.90% 62.13% 69.09% 
 Risk-free interest rate 1.22% 0.63% 0.61% 1.99% 0.58% 
 Expected term (years) 4.0  4.0  4.0  5.0  4.0  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   Year Ended December 31,  
   2014  2013  2012  
 2014 Stock option awards$227 $0 $0  
 2013 Stock option awards$213 $174 $0  
 2012 Stock option awards$199 $189 $167  
 2011 Stock option awards$24 $138 $164  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
    Weighted 
    Average Grant 
  Number of Date Fair Value 
  Shares (per share) 
 Nonvested awards, December 31, 2013115,984 $47.27 
 Granted56,258 $73.95 
 Vested(43,897) $41.17 
 Forfeited(3,895) $37.01 
 Nonvested awards, December 31, 2014124,450 $61.80 
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
    Weighted 
    Average Grant 
  Number of Date Fair Value 
  Units (per unit) 
 Nonvested awards, December 31, 20134,018 $49.71 
 Granted3,140 $75.52 
 Nonvested awards, December 31, 20147,158 $61.03