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Earnings per Share/Capital Stock: (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Basic        
Net income $ 16,602 $ 15,078 $ 30,067 $ 25,193
Less: Distributed earnings to common shareholders 6,854 5,287 13,693 10,560
Less: Distributed earnings to participating securities 95 38 181 68
Undistributed earnings 9,653 9,753 16,193 14,565
Undistributed earnings allocated to common shareholders 9,522 9,683 15,982 14,472
Undistributed earnings allocated to participating securities 131 70 211 93
Total income available to common shareholders, basic 16,376 14,970 29,675 25,032
Weighted average Common Shares outstanding, basic 19,306 18,882 19,285 18,857
Basic earnings per Common Share (in dollars per share) $ 0.85 $ 0.79 $ 1.54 $ 1.33
Diluted        
Total income available to common shareholders, basic 16,376 14,970 29,675 25,032
Undistributed earnings for dilutive stock options 0 0 0 93
Total common shareholders earnings, diluted $ 16,376 $ 14,970 $ 29,675 $ 25,125
Weighted average Common Shares outstanding, basic 19,306 18,882 19,285 18,857
Stock-based compensation 40 [1] 63 [1] 39 [1] 131 [1]
Weighted average common shares outstanding, diluted 19,346 18,945 19,324 18,988
Diluted earnings per Common Share $ 0.85 $ 0.79 $ 1.54 $ 1.32
[1] In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 140,834 and 410,760 stock options at June 30, 2013 and 2012, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share. All of the 130,453 and 147,109 restricted stock units at June 30, 2013 and 2012, respectively, were included in the calculation of diluted EPS for the six months ended June 30, 2013 and 2012.