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Net Income Per Common Share (Tables)
 12 Months Ended
Sep. 30, 2017
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, 2017, 2016 and 2015 is as follows (dollars in thousands, except per share amounts):
 
2017

 
2016

 
2015

Basic net income per common share computation
 
 
 
 
 
Numerator - net income to common shareholders
$
14,167

 
$
10,154

 
$
8,292

 
 
 
 
 
 
  Denominator - weighted average common shares outstanding
7,136,690

 
6,842,614

 
6,897,270

 
 
 
 
 
 
Basic net income per common share
$
1.99

 
$
1.48

 
$
1.20

 
 
 
 
 
 
Diluted net income per common share computation
 

 
 

 
 

Numerator - net income to common shareholders
$
14,167

 
$
10,154

 
$
8,292

 
 
 
 
 
 
  Denominator - weighted average common shares outstanding
7,136,690

 
6,842,614

 
6,897,270

Effect of dilutive stock options (1)
163,773

 
78,910

 
36,863

Effect of dilutive stock warrant (2)
79,590

 
183,825

 
134,955

  Weighted average common shares outstanding-assuming dilution
7,380,053

 
7,105,349

 
7,069,088

 
 
 
 
 
 
Diluted net income per common share
$
1.92

 
$
1.43

 
$
1.17