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Earnings Per Share - Basic and diluted earnings per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Numerator:    
Net income per consolidated statements of income $ 2,903 $ 3,670
Less: Allocation of earnings to participating securities (30)  
Net income allocated to common stock 2,873 3,670
Basic earnings per share computation:    
Net income allocated to common stock $ 2,873 $ 3,670
Weighted average common shares outstanding, including shares considered participating securities 7,753 7,616
Less: Weighted average participating securities outstanding (81)  
Weighted average shares of common stock 7,672 7,616
Basic earnings per share (in dollars per share) $ 0.37 $ 0.48
Diluted earnings per share computation:    
Net income allocated to common stock $ 2,873 $ 3,670
Undistributed earnings re-allocated to participating securities   0
Net income allocated to common stock $ 2,873 $ 3,670
Weighted average common shares outstanding for basic earnings per share 7,672 7,616
Incremental shares from stock options 60 127
Weighted average shares and dilutive potential common shares 7,732 7,743
Diluted earnings per share (in dollars per share) $ 0.37 $ 0.47