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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Unearned Shares Issued to ESOP
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance at Sep. 30, 2014 $ 82,778 $ 10,773 $ (1,190) $ 73,534 $ (339) [1]
Beginning Balance (in shares) at Sep. 30, 2014   7,047,336      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 8,292     8,292  
Other comprehensive income 26       26
Repurchase of common stock (709) $ (709)      
Repurchase of common stock (in shares)   (64,788)      
Exercise of stock options $ 30 $ 30      
Exercise of stock options (in shares) 6,300 6,300      
Common stock dividends ($0.24, $0.37, and $0.50 per share, respectively) $ (1,693)     (1,693)  
Earned ESOP shares, net of income taxes 336 $ 72 264    
Stock option/MRDP compensation expense 127 127      
Ending Balance at Sep. 30, 2015 89,187 $ 10,293 (926) 80,133 (313) [1]
Ending Balance (in shares) at Sep. 30, 2015   6,988,848      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 10,154     10,154  
Other comprehensive income 138       138
Repurchase of common stock (820) $ (820)      
Repurchase of common stock (in shares)   (66,000)      
Exercise of stock options $ 159 $ 159      
Exercise of stock options (in shares) 21,020 21,020      
Common stock dividends ($0.24, $0.37, and $0.50 per share, respectively) $ (2,578)     (2,578)  
Earned ESOP shares, net of income taxes 404 $ 139 265    
Stock option/MRDP compensation expense 190 190      
Ending Balance at Sep. 30, 2016 96,834 $ 9,961 (661) 87,709 (175) [1]
Ending Balance (in shares) at Sep. 30, 2016   6,943,868      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 14,167     14,167  
Other comprehensive income 51       51
Exercise of stock warrant 2,496 $ 2,496      
Exercise of stock warrant (in shares)   370,899      
Exercise of stock options $ 332 $ 332      
Exercise of stock options (in shares) 46,310 46,310      
Common stock dividends ($0.24, $0.37, and $0.50 per share, respectively) $ (3,641)     (3,641)  
Earned ESOP shares, net of income taxes 605 $ 341 264    
Stock option/MRDP compensation expense 156 156      
Ending Balance at Sep. 30, 2017 $ 111,000 $ 13,286 $ (397) $ 98,235 $ (124) [1]
Ending Balance (in shares) at Sep. 30, 2017   7,361,077      
[1] All amounts are net of income taxes.