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Stock-Based Compensation Plans (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]    
Compensation expense, gross $ 1,278,000 $ 997,000
Stock Options [Member]
    
Options, shares [Roll Forward]    
Outstanding, beginning of period (in shares) 59,400  
Expired (in shares) (2,000)  
Exercised (in shares) (24,750)  
Forfeited, other (in shares) 0  
Outstanding, end of period (in shares) 32,650  
Options exercisable, end of period (in shares) 32,650  
Options, weighted average exercise price [Roll Forward]    
Outstanding, beginning of period (in dollars per share) $ 12.35  
Expired (in dollars per share) $ 14.43  
Exercised (in dollars per share) $ 12.41  
Forfeited, other (in dollars per share) $ 0  
Outstanding, end of period (in dollars per share) $ 12.19  
Options exercisable, end of period (in dollars per share) $ 12.19  
Options, additional disclosures [Abstract]    
Outstanding, weighted average remaining contractual term, beginning of period 2 years 10 months 24 days  
Outstanding, weighted average remaining contractual term, end of period 2 years 6 months 0 days  
Options exercisable, weighted average remaining contractual term, end of period 2 years 6 months 0 days  
Aggregate intrinsic value of outstanding stock options 100,000  
Total intrinsic value of options exercised 300,000  
Options granted (in shares) 0  
Performance-based Shares [Member]
    
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 [Member]
    
Restricted and Performance Stock Grants [Abstract]    
Award vesting rights Restricted shares granted to employees become fully vested upon the third anniversary of the date of grant; and for selected key executives certain 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.  
Restricted Shares [Member] | Employees [Member]
    
Restricted and Performance Stock Grants [Abstract]    
Estimated forfeitures (in hundredths) 5.00%  
Restricted Shares [Member] | Executives [Member]
    
Restricted and Performance Stock Grants [Abstract]    
Estimated forfeitures (in hundredths) 0.00%  
Restricted Shares [Member] | Directors [Member]
    
Restricted and Performance Stock Grants [Abstract]    
Estimated forfeitures (in hundredths) 0.00%  
Restricted Shares [Member] | Age 60 [Member]
    
Restricted and Performance Stock Grants [Abstract]    
Vesting percentage (in hundredths) 25.00%  
Restricted Shares [Member] | Age 63 [Member]
    
Restricted and Performance Stock Grants [Abstract]    
Vesting percentage (in hundredths) 25.00%  
Restricted and Performance-based Shares [Member]
    
Restricted and performance-based stock, shares [Roll Forward]    
Beginning of period (in shares) 458,050  
Granted (in shares) 6,000  
Vested (in shares) (9,600)  
Forfeited (in shares) (5,225)  
End of period (in shares) 449,225  
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]    
Beginning of period (in dollars per share) $ 11.92  
Granted (in dollars per share) $ 12.43  
Vested (in dollars per share) $ 13.03  
Forfeited (in dollars per share) $ 12.16  
End of period (in dollars per share) $ 11.90  
Compensation expense, gross 913,465 631,250
Compensation expense, net of tax 570,367 386,950
Unamortized compensation expense $ 3,000,000  
Restricted and Performance-based Shares [Member] | Employees [Member]
    
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]    
Weighted average period of recognition for unrecognized compensation expense 4 years 4 months 24 days  
Restricted and Performance-based Shares [Member] | Directors [Member]
    
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]    
Weighted average period of recognition for unrecognized compensation expense 0 years 9 months 18 days