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Earnings per share (Tables)
 6 Months Ended
Jun. 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 six month periods ended June 30, 2017 and June 30, 2016.
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Net income available to common shareholders
$
1,648,286

 
$
921,630

 
$
3,097,138

 
$
2,058,493

Weighted average common shares outstanding
8,216,567

 
5,820,342

 
7,872,609

 
5,813,915

Effect of dilutive stock options
108,971

 
311,478

 
104,673

 
304,615

Diluted shares
8,325,538

 
6,131,820

 
7,977,282

 
6,118,530

Basic earnings per common share
$
0.20

 
$
0.16

 
$
0.39

 
$
0.35

Diluted earnings per common share
$
0.20

 
$
0.15

 
$
0.39

 
$
0.34