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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Unearned Shares Issued to Employee Stock Ownership Plan ("ESOP") | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Beginning Balance at Sep. 30, 2017 | $ 111,000 | $ 13,286 | $ (397) | $ 98,235 | $ (124)
Beginning Balance (in shares) at Sep. 30, 2017 |  | 7,361,077 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 16,721 |  |  | 16,721 |
Other comprehensive loss | (5) |  |  |  | (5)
Exercise of stock options | $ 318 | $ 318 |  |  |
Exercise of stock options (in shares) | 40,100 | 40,100 |  |  |
Common stock dividends | $ (4,431) |  |  | (4,431) |
Earned ESOP shares, net of income taxes | 882 | $ 618 | 264 |  |
Stock option compensation expense | 172 | 172 |  |  |
Ending Balance at Sep. 30, 2018 | 124,657 | $ 14,394 | (133) | 110,525 | (129)
Ending Balance (in shares) at Sep. 30, 2018 |  | 7,401,177 |  |  |
Beginning Balance at Sep. 30, 2018 | 124,657 | $ 14,394 | (133) | 110,525 | (129)
Beginning Balance (in shares) at Sep. 30, 2018 |  | 7,401,177 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 24,020 |  |  | 24,020 |
Other comprehensive loss | $ 116 |  |  |  | 116
Repurchase of common stock |  | $ (499) |  |  |
Repurchase of common stock (in shares) | (499,000) | (20,440) |  |  |
Common stock issued for business combination (shares) |  | 904,826 |  |  |
Common stock issued for business combination | $ 28,267 | $ 28,267 |  |  |
Exercise of stock options | $ 401 | $ 401 |  |  |
Exercise of stock options (in shares) | 43,856 | 43,856 |  |  |
Common stock dividends | $ (6,495) |  |  | (6,495) |
Earned ESOP shares, net of income taxes | 441 | $ 308 | 133 |  |
Stock option compensation expense | 159 | 159 |  |  |
Ending Balance at Sep. 30, 2019 | 171,067 | $ 43,030 | $ 0 | 127,987 | 50
Ending Balance (in shares) at Sep. 30, 2019 |  | 8,329,419 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Adoption of Accounting Standards Update ("ASU") 2016-01 |  |  |  | (63) | 63
Net income | 24,269 |  |  | 24,269 |
Other comprehensive loss | 11 |  |  |  | 11
Repurchase of common stock | (1,238) | $ (1,238) |  |  |
Repurchase of common stock (in shares) |  | (56,601) |  |  |
Exercise of stock options | $ 391 | $ 391 |  |  |
Exercise of stock options (in shares) | 37,975 | 37,975 |  |  |
Common stock dividends | $ (7,083) |  |  | (7,083) |
Earned ESOP shares, net of income taxes | 31 | $ 31 |  |  |
Stock option compensation expense | 182 | 182 |  |  |
Ending Balance at Sep. 30, 2020 | $ 187,630 | $ 42,396 |  | $ 145,173 | $ 61
Ending Balance (in shares) at Sep. 30, 2020 |  | 8,310,793 |  |  |

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