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Share-based compensation (Details 3) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Y
Jun. 30, 2011
Restricted shares
       
Restricted stock awards and restricted stock units        
Outstanding, beginning of period (in shares) 38,107 88,709 46,807 89,709
Vested (in shares) (23,300) (29,800) (32,000) (29,800)
Forfeited (in shares)   (1,000)   (2,000)
Outstanding, end of period (in shares) 14,807 57,909 14,807 57,909
Weighted-average grant-date fair value per share        
Outstanding, beginning of period (in dollars per share) $ 23.83 $ 24.63 $ 24.45 $ 24.64
Vested (in dollars per share) $ 24.71 $ 26.03 $ 25.38 $ 26.03
Forfeited (in dollars per share)   $ 24.68   $ 25.02
Outstanding, end of period (in dollars per share) $ 22.45 $ 23.91 $ 22.45 $ 23.91
Unrecognized compensation cost $ 200,000   $ 200,000  
Weighted-average period over which unrecognized compensation cost expected to be recognized (in years)     2.4  
Aggregate fair value of vested shares and related dividends     800,000 800,000
Tax benefits     200,000 100,000
Restricted stock units
       
Restricted stock awards and restricted stock units        
Outstanding, beginning of period (in shares) 318,551 230,517 247,286 146,500
Granted (in shares) 2,334 1,000 94,846 86,017
Vested (in shares) (250)   (21,497)  
Forfeited (in shares) (1,564)   (1,564) (1,000)
Outstanding, end of period (in shares) 319,071 231,517 319,071 231,517
Weighted-average grant-date fair value per share        
Outstanding, beginning of period (in dollars per share) $ 22.80 $ 21.69 $ 21.80 $ 19.80
Granted (in dollars per share) $ 26.75 $ 26.25 $ 26.00 $ 24.97
Vested (in dollars per share) $ 26.25   $ 24.97  
Forfeited (in dollars per share) $ 25.53   $ 25.53 $ 22.60
Outstanding, end of period (in dollars per share) $ 22.81 $ 21.70 $ 22.81 $ 21.70
Total weighted-average grant-date fair value 62,000 26,000 2,500,000 2,100,000
Unrecognized compensation cost 4,300,000   4,300,000  
Weighted-average period over which unrecognized compensation cost expected to be recognized (in years)     2.9  
Aggregate fair value of vested shares and related dividends     600,000  
Tax benefits     $ 200,000