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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Distributed earnings allocated to common stock                 $ 23,100 $ 20,603 $ 20,102
Undistributed earnings allocated to common stock                 24,678 18,034 20,280
Net earnings allocated to common shareholders                 $ 47,778 $ 38,637 $ 40,382
Average common shares outstanding 15,636,000 15,608,000 15,582,000 15,473,000 14,755,000 14,751,000 14,680,000 14,679,000 15,564,000 14,714,000 15,055,000
Warrants Outstanding                 60,000    
Employee Stock Options                 84,000 82,000 75,000
Shares for diluted earnings per share 15,799,000 15,790,000 15,752,000 15,627,000 14,837,000 14,834,000 14,759,000 14,759,000 15,708,000 14,796,000 15,130,000
Basic earnings per share $ 0.84 $ 0.89 $ 0.83 $ 0.51 $ 0.73 $ 0.71 $ 0.50 $ 0.68 $ 3.07 $ 2.63 $ 2.68
Diluted earnings per share $ 0.83 $ 0.88 $ 0.82 $ 0.51 $ 0.73 $ 0.71 $ 0.50 $ 0.67 $ 3.04 $ 2.61 $ 2.67
Options to purchase shares of common stock, anti-dilutive                 0 124,000 222,000
Common stock exercise price, lower limit                   $ 35.09 $ 32.09
Common stock exercise price, upper limit                   $ 40.88 $ 40.88