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Stock-Based Compensation Plans (Details) (USD $)
 6 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Stock Options [Member]
Jun. 30, 2013
Performance-based Shares [Member]
Jun. 30, 2013
Restricted and Performance-based Shares [Member]
Jun. 30, 2012
Restricted and Performance-based Shares [Member]
Jun. 30, 2013
Restricted and Performance-based Shares [Member]
Employees [Member]
Jun. 30, 2013
Restricted and Performance-based Shares [Member]
Executives [Member]
Jun. 30, 2013
Restricted and Performance-based Shares [Member]
Directors [Member]
Jun. 30, 2013
Restricted and Performance-based Shares [Member]
Age 60 [Member]
Jun. 30, 2013
Restricted and Performance-based Shares [Member]
Age 63 [Member]
Jun. 30, 2013
Restricted and Performance-based Shares [Member]
Age65 [Member]
Options, shares [Roll Forward]                        
Outstanding, beginning of period (in shares)     29,150                  
Expired (in shares)     0                  
Exercised (in shares)     (11,525)                  
Forfeited, other (in shares)     0                  
Outstanding, end of period (in shares)     17,625                  
Options exercisable, end of period (in shares)     17,625                  
Options, weighted average exercise price [Roll Forward]                        
Outstanding, beginning of period (in dollars per share)     $ 12.20                  
Expired (in dollars per share)     $ 0                  
Exercised (in dollars per share)     $ 12.37                  
Forfeited, other (in dollars per share)     $ 0                  
Outstanding, end of period (in dollars per share)     $ 12.09                  
Options exercisable, end of period (in dollars per share)     $ 12.09                  
Options, additional disclosures [Abstract]                        
Outstanding, weighted average remaining contractual term, beginning of period     1 year 10 months 24 days                  
Outstanding, weighted average remaining contractual term, end of period     1 year 7 months 6 days                  
Options exercisable, weighted average remaining contractual term, end of period     1 year 7 months 6 days                  
Aggregate intrinsic value of outstanding stock options     $ 400,000                  
Total intrinsic value of options exercised     200,000                  
Options granted (in shares)     0                  
Restricted and Performance Stock Grants [Abstract]                        
Measuring period for performance-based shares       3 years                
Award vesting rights       Selected executives and other key personnel are granted performance awards whose vesting is contingent upon meeting various performance measures with a retention feature. Performance-based shares are subject to a three year measuring period and the achievement of performance targets and, depending upon the achievement of such performance targets, they may become vested on the third anniversary of the date of grant. Restricted shares granted to employees become fully vested upon the third anniversary of the date of grant; and for selected key executives certain additional restricted share grants vest 25% upon the attainment of age 60, 25% upon the attainment of age 63 and become fully vested upon the attainment of age 65. Restricted shares granted to directors become fully vested upon the first anniversary of the date of grant.              
Vesting percentage (in hundredths)                   25.00% 25.00% 100.00%
Estimated forfeitures (in hundredths)             5.00% 0.00% 0.00%      
Restricted and performance-based stock, shares [Roll Forward]                        
Beginning of period (in shares)         533,625              
Granted (in shares)         7,000              
Vested (in shares)         (8,075)              
Forfeited (in shares)         (4,575)              
End of period (in shares)         527,975              
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]                        
Beginning of period (in dollars per share)         $ 13.03              
Granted (in dollars per share)         $ 32.01              
Vested (in dollars per share)         $ 12.69              
Forfeited (in dollars per share)         $ 13.54              
End of period (in dollars per share)         $ 13.28              
Compensation expense, gross 1,494,000 1,278,000     1,072,847 913,465            
Compensation expense, net of tax         666,895 570,367            
Unamortized compensation expense         $ 4,200,000              
Weighted average period of recognition for unrecognized compensation expense             4 years 10 months 24 days   8 months 12 days