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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Basic EPS:                      
Net income available to common shareholders                 $ 29,353 $ 24,181 $ 34,520
Weighted-average common shares outstanding                 18,166,175 18,250,173 18,637,167
Basic earnings per share $ 0.51 $ 0.39 $ 0.19 $ 0.53 $ 0.45 $ 0.27 $ 0.25 $ 0.36 $ 1.62 $ 1.32 $ 1.85
Diluted EPS:                      
Income allocable to common shareholders                 $ 29,353 $ 24,181 $ 34,520
Weighted-average common shares outstanding                 18,166,175 18,250,173 18,637,167
Diluted effect:                      
Diluted effect, restricted shares and stock options                 408,958 450,809 458,153
Long-term incentive awards                 6,000    
Weighted average participating shares                 18,575,133 18,700,982 19,095,320
Diluted earnings per share $ 0.50 $ 0.38 $ 0.19 $ 0.52 $ 0.44 $ 0.26 $ 0.24 $ 0.35 $ 1.58 $ 1.29 $ 1.81
Stock Options [Member]
                      
Diluted effect:                      
Diluted effect, restricted shares and stock options                 391,000 440,000 449,000
Restricted Stock [Member]
                      
Diluted effect:                      
Diluted effect, restricted shares and stock options                 12,000 11,000 9,000