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Stock-Based Compensation Plans (Details 2) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Options      
Exercised (in shares) (66,458) (37,006) (131,448)
Options outstanding at the end of the period (in shares) 150,606    
Additional disclosure      
Cash proceeds from the exercise of stock options $ 1,198,000 $ 589,000 $ 2,111,000
Tax benefit for the tax deduction from awards exercised 877,000 $ 533,000 $ 1,026,000
Unrecognized compensation cost $ 874,000    
Weighted Average Grant-Date Value      
Restricted Stock, Units, Outstanding 0    
Maximum      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 2 years    
Percentage of target amount of performance shares 200.00%    
Minimum      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 1 year    
Percentage of target amount of performance shares 0.00%    
Stock options      
Number of Options      
Options Outstanding at the beginning of the period (in shares) 222,580    
Granted (in shares) 0 0 0
Exercised (in shares) (66,458)    
Forfeited or expired (in shares) (5,516)    
Options outstanding at the end of the period (in shares) 150,606 222,580  
Options exercisable at the end of the period (in shares) 150,606    
Weighted Average Exercise Price      
Options outstanding at the beginning of the period (in dollars per share) $ 17.47    
Granted (in dollars per share) 0.00    
Exercised (in dollars per share) 18.02    
Forfeited or expired (in dollars per share) 12.96    
Options outstanding at the end of the period (in dollars per share) 17.39 $ 17.47  
Options exercisable at the end of the period (in dollars per share) $ 17.39    
Additional disclosure      
Weighted Average Remaining Contractual Term, Options outstanding 2 years 8 months 28 days    
Weighted Average Remaining Contractual Term, Options Exercisable 2 years 8 months 28 days    
Aggregate Intrinsic Value, Options outstanding $ 3,699,468    
Aggregate Intrinsic Value, Options Exercisable 3,699,468    
Total intrinsic value of options exercised 1,457,000 $ 596,000 $ 1,402,000
Tax benefit for the tax deduction from awards exercised 877,000 $ 533,000 1,026,000
Restricted Stock Units      
Additional disclosure      
Unrecognized compensation cost related to performance awards $ 753,000    
Number of Restricted/Performance Share Units      
Restricted share units at the beginning of the period (in shares) 145,475    
Granted (in shares) 41,100    
Vested (in shares) (73,523)    
Forfeited (in shares) (1,717)    
Restricted share units at the end of the period (in shares) 111,335 145,475  
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 21.61    
Granted (in dollars per share) 40.31    
Vested (in dollars per share) 24.87    
Forfeited (in dollars per share) 31.13    
Restricted share units at the end of the period (in dollars per share) $ 26.21 $ 21.61  
Restricted Stock Units | Maximum      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 2 years 9 months 26 days    
Restricted Stock Units | Minimum      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 29 days    
Performance awards      
Additional disclosure      
Vesting period 3 years    
Period to meet the performance goals 3 years    
Number of Restricted/Performance Share Units      
Restricted share units at the beginning of the period (in shares) 75,827    
Granted (in shares) 29,597    
Vested (in shares) (4,269)    
Restricted share units at the end of the period (in shares) 131,953 75,827  
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 27.78    
Granted (in dollars per share) 41.24    
Vested (in dollars per share) 36.87    
Restricted share units at the end of the period (in dollars per share) $ 30.66 $ 27.78  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Criteria Adjustment 30,798    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Criteria Adjustment, Weighted Average Grant Date Fair Value $ 28.44    
GSWC      
Additional disclosure      
Tax benefit for the tax deduction from awards exercised $ 872,000 $ 514,000 943,000
GSWC | Stock options      
Additional disclosure      
Tax benefit for the tax deduction from awards exercised $ 872,000 $ 514,000 $ 943,000