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Summary of Significant Accounting Policies - Basic and diluted earnings per share (Details 1) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Numerator:                      
Net income per consolidated statements of income $ (1,070) $ 1,606 $ 1,970 $ 2,903 $ 2,726 $ 2,727 $ 3,256 $ 3,670 $ 5,409 $ 12,379 $ 16,856
Less: Allocation of earnings to participating securities                 (70) (170)  
Net income allocated to common stock                 5,339 12,209 16,856
Basic earnings per share computation:                      
Net income allocated to common stock                 $ 5,339 $ 12,209 $ 16,856
Weighted average common shares outstanding, including shares considered participating securities                 7,766 7,727 12,013
Less: Weighted average participating securities outstanding                 (102) (105)  
Weighted average shares of common stock                 7,664 7,622 12,013
Basic earnings per share (in dollars per share) $ (0.14) $ 0.21 $ 0.25 $ 0.37 $ 0.35 $ 0.36 $ 0.43 $ 0.48 $ 0.70 $ 1.60 $ 1.40
Diluted earnings per share computation:                      
Net income allocated to common stock                 $ 5,339 $ 12,209 $ 16,856
Undistributed earnings re-allocated to participating securities                   2  
Numerator for diluted earnings per share                 $ 5,339 $ 12,211 $ 16,856
Weighted average common shares outstanding for basic earnings per share                 7,664 7,622 12,013
Incremental shares from stock options                 62 70 179
Weighted average shares and dilutive potential common shares                 7,726 7,692 12,192
Diluted earnings per share (in dollars per share) $ (0.14) $ 0.21 $ 0.25 $ 0.37 $ 0.35 $ 0.35 $ 0.42 $ 0.47 $ 0.69 $ 1.59 $ 1.38