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Earnings per Share - Calculation of earnings per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Basic earnings per common share:    
Net income $ 1,083 $ 4,684
Less: Preferred stock dividend declared (1,313) (1,323)
Net (loss) income available for distribution (230) 3,361
Income allocated to participating securities 0 (1,513)
Net (loss) income available to common shareholders $ (230) $ 1,848
Weighted average basic shares outstanding (in shares) 32,658 25,663
Basic loss per common share (in dollars per share) $ (0.01) $ 0.07
Diluted earnings per common share:    
Net (loss) income available to common shareholders $ (230) $ 1,848
Weighted average basic shares outstanding (in shares) 32,658 25,663
Dilutive effect related to employee stock plans (in shares) 0 375
Weighted average diluted shares outstanding (in shares) 32,658 26,038
Diluted loss per common share (in dollars per share) $ (0.01) $ 0.07