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Earnings per Common Share - Computation of Basic and Diluted Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share, Basic [Abstract]        
Net income $ 5,436 $ 7,031 $ 10,120 $ 10,540
Weighted average shares outstanding - basic (shares) 25,939 25,819 25,863 26,110
Basic EPS (US$ per share) $ 0.21 $ 0.27 $ 0.39 $ 0.40
Earnings Per Share, Diluted [Abstract]        
Dilutive stock options 59 64 65 76
Dilutive nonvested deferred shares 206 228 244 234
Diluted weighted average shares (shares) 26,204 26,111 26,172 26,420
Diluted EPS (US$ per share) $ 0.21 $ 0.27 $ 0.39 $ 0.40