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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Stock Options
Number of Shares
Number of Shares
Stock Options
Unearned Shares Issued to ESOP
Retained Earnings
Accumulated Other Comprehensive Loss
Balance at beginning of period (in shares) at Sep. 30, 2017     7,361,077        
Balance at beginning of period at Sep. 30, 2017 $ 111,000   $ 13,286   $ (397) $ 98,235 $ (124) [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 7,883         7,883  
Other comprehensive income (loss) $ (8)           (8)
Exercise of stock options (in shares) 29,150   29,150        
Exercise of stock options $ 234   $ 234        
Common stock dividends (1,769)         (1,769)  
Earned ESOP shares, net of income taxes 416   $ 284   132    
Stock option compensation expense   $ 87   $ 87      
Balance at end of period (in shares) at Mar. 31, 2018     7,390,227        
Balance at end of period at Mar. 31, 2018 117,843   $ 13,891   (265) 104,349 (132) [1]
Balance at beginning of period (in shares) at Dec. 31, 2017     7,367,327        
Balance at beginning of period at Dec. 31, 2017 114,112   $ 13,540   (331) 101,039 (136) [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 4,269         4,269  
Other comprehensive income (loss) 4           4
Exercise of stock options (in shares)     22,900        
Exercise of stock options 173   $ 173        
Common stock dividends (959)         (959)  
Earned ESOP shares, net of income taxes 201   $ 135   66    
Stock option compensation expense   43   43      
Balance at end of period (in shares) at Mar. 31, 2018     7,390,227        
Balance at end of period at Mar. 31, 2018 117,843   $ 13,891   (265) 104,349 (132) [1]
Balance at beginning of period (in shares) at Sep. 30, 2018     7,401,177        
Balance at beginning of period at Sep. 30, 2018 124,657 [2]   $ 14,394   (133) 110,525 (129) [1]
Balance at beginning of period (in shares) at Sep. 30, 2018     7,401,177        
Balance at beginning of period at Sep. 30, 2018 124,657 [2]   $ 14,394   (133) 110,525 (129) [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 11,729         11,729  
Other comprehensive income (loss) $ 21           21
Exercise of stock options (in shares) 30,416   30,416        
Exercise of stock options $ 283   $ 283        
Common stock dividends (3,159)         (3,159)  
Earned ESOP shares, net of income taxes $ 434   $ 301   133    
Stock option compensation expense   106   106      
Common stock issued for business combination (in shares) 904,826            
Common stock issued for business combination $ 28,267            
Balance at end of period (in shares) at Mar. 31, 2019     8,336,419        
Balance at end of period at Mar. 31, 2019 162,338   $ 43,351   0 119,032 (45) [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adoption of Accounting Standards Update (ASU) 2016-01 | Accounting Standards Update 2016-01 0         (63) 63
Balance at beginning of period (in shares) at Dec. 31, 2018     8,313,403        
Balance at beginning of period at Dec. 31, 2018 156,905   $ 42,951   (67) 114,166 (145) [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 6,114         6,114  
Other comprehensive income (loss) 100           100
Exercise of stock options (in shares)     23,016        
Exercise of stock options 212   $ 212        
Common stock dividends (1,248)         (1,248)  
Earned ESOP shares, net of income taxes 202   $ 135   67    
Stock option compensation expense   $ 53   $ 53      
Balance at end of period (in shares) at Mar. 31, 2019     8,336,419        
Balance at end of period at Mar. 31, 2019 $ 162,338   $ 43,351   $ 0 $ 119,032 $ (45) [1]
[1] All amounts are net of income taxes.
[2] Derived from audited consolidated financial statements.