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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
 
The following is a summary of the basic and diluted earnings per share for the three and nine month periods ended September 30, 2017 and September 30, 2016.

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Net income available to common shareholders
$
1,684,869

 
$
1,340,892

 
$
4,782,007

 
$
3,399,385

Weighted average common shares outstanding
8,234,783

 
5,834,520

 
7,994,661

 
5,820,834

Effect of dilutive stock options
97,897

 
261,813

 
91,685

 
271,201

Diluted shares
8,332,680

 
6,096,333

 
8,086,346

 
6,092,035

Basic earnings per common share
$
0.20

 
$
0.23

 
$
0.60

 
$
0.58

Diluted earnings per common share
$
0.20

 
$
0.22

 
$
0.59

 
$
0.56