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Net Income Per Common Share (Tables)
 12 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share
Information regarding the calculation of basic and diluted net income per common share for the years ended September 30, 2018, 2017 and 2016 is as follows (dollars in thousands, except per share amounts):
 
2018

 
2017

 
2016

Basic net income per common share computation
 
 
 
 
 
Numerator - net income to common shareholders
$
16,721

 
$
14,167

 
$
10,154

 
 
 
 
 
 
  Denominator - weighted average common shares outstanding
7,334,577

 
7,136,690

 
6,842,614

 
 
 
 
 
 
Basic net income per common share
$
2.28

 
$
1.99

 
$
1.48

 
 
 
 
 
 
Diluted net income per common share computation
 

 
 

 
 

Numerator - net income to common shareholders
$
16,721

 
$
14,167

 
$
10,154

 
 
 
 
 
 
  Denominator - weighted average common shares outstanding
7,334,577

 
7,136,690

 
6,842,614

Effect of dilutive stock options (1)
191,767

 
163,773

 
78,910

Effect of dilutive stock warrant (2)
—

 
79,590

 
183,825

  Weighted average common shares outstanding-assuming dilution
7,526,344

 
7,380,053

 
7,105,349

 
 
 
 
 
 
Diluted net income per common share
$
2.22

 
$
1.92

 
$
1.43