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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 9 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2022
Jun. 30, 2021
Basic earnings per common share:                
Net income $ 843 $ 7,354 $ 14,822 $ 3,000 $ (1,547) $ 1,083 $ 23,019 $ 2,536
Less: Preferred stock dividend declared (1,296)     (1,313)     (3,913) (3,938)
Net (loss) income available for distribution (453)     1,687     19,106 (1,402)
Income allocated to participating securities 0     (659)     (7,272) 0
Net (loss) income available to common shareholders $ (453)     $ 1,028     $ 11,834 $ (1,402)
Weighted average basic shares outstanding (in shares) 33,257     32,821     33,032 32,746
Basic (loss) income per common share (in dollars per share) $ (0.01)     $ 0.03     $ 0.36 $ (0.04)
Diluted earnings per common share:                
Net (loss) income available to common shareholders $ (453)     $ 1,028     $ 11,834 $ (1,402)
Weighted average basic shares outstanding (in shares) 33,257     32,821     33,032 32,746
Dilutive effect related to employee stock plans (in shares) 0     215     518 0
Weighted average diluted shares outstanding (in shares) 33,257     33,036     33,550 32,746
Diluted (loss) income per common share (in dollars per share) $ (0.01)     $ 0.03     $ 0.35 $ (0.04)
Dilutive shares under the as-converted method (in shares) 54,174     54,057     53,847 53,950