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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2018
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 months ended June 30, 2018 and 2017.

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Net income available to common shareholders
$
3,931,556

 
$
1,648,286

 
$
7,346,326

 
$
3,097,138

Weighted average common shares outstanding
12,201,185

 
8,216,567

 
11,708,746

 
7,872,609

Effect of dilutive stock options
119,313

 
108,971

 
113,751

 
104,673

Diluted shares
12,320,498

 
8,325,538

 
11,822,497

 
7,977,282

Basic earnings per common share
$
0.32

 
$
0.20

 
$
0.63

 
$
0.39

Diluted earnings per common share
$
0.32

 
$
0.20

 
$
0.62

 
$
0.39