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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Outstanding stock options (in shares) 0 0 0 0
Distributed earnings allocated to common stock $ 4,653 $ 4,293 $ 9,339 $ 8,589
Undistributed earnings allocated to common stock 9,728 11,186 18,745 20,249
Net earnings allocated to common stock 14,381 15,479 28,084 28,838
Net earnings allocated to participating securities 98 151 213 303
Net income allocated to common stock and participating securities $ 14,479 $ 15,630 $ 28,297 $ 29,141
Weighted average shares outstanding for basic earnings per common share 25,853,537 26,212,999 [1] 25,888,534 26,235,511 [1]
Dilutive effect of stock compensation (in shares) 0 0 0 0
Weighted average shares outstanding for diluted earnings per common share 25,853,537 26,212,999 [1] 25,888,534 26,235,511 [1]
Basic earnings per common share (in dollars per share) $ 0.56 $ 0.59 [1] $ 1.08 $ 1.10 [1]
Diluted earnings per common share (in dollars per share) $ 0.56 $ 0.59 [1] $ 1.08 $ 1.10 [1]
[1] *The computation of the three and six months ended June 30, 2015 per common share data and shares outstanding gives retrospective recognition to a 10% stock dividend declared on July 22, 2015 and issued on August 14, 2015.