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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The computation of basic and diluted earnings per share is shown below:
 
Three months ended September 30,
 
Nine months ended September 30,
 
2018
 
2017
 
2018
 
2017
Basic earnings per common share computation:
 
 
 
 
 
 
 
Net income per consolidated statements of income
$
9,236

 
$
7,246

 
$
24,774

 
$
20,409

Net earnings allocated to participating securities
(40
)
 
(40
)
 
(113
)
 
(120
)
Net earnings allocated to common stock
$
9,196

 
$
7,206

 
$
24,661

 
$
20,289

Distributed earnings allocated to common stock
$
2,586

 
$
2,506

 
$
7,607

 
$
7,521

Undistributed earnings allocated to common stock
6,610

 
4,700

 
17,054

 
12,768

Net earnings allocated to common stock
$
9,196

 
$
7,206

 
$
24,661

 
$
20,289

Weighted average common shares outstanding, including shares considered participating securities
15,285

 
15,285

 
15,281

 
15,188

Less: Average participating securities
(60
)
 
(78
)
 
(67
)
 
(84
)
Weighted average shares
15,225

 
15,207

 
15,214

 
15,104

Basic earnings per common share
$
0.60

 
$
0.47

 
$
1.62

 
$
1.34

Diluted earnings per common share computation:
 
 
 
 
 
 
 
Net earnings allocated to common stock
$
9,196

 
$
7,206

 
$
24,661

 
$
20,289

Weighted average shares and dilutive potential common shares
15,225

 
15,207

 
15,214

 
15,104

Diluted earnings per common share
$
0.60

 
$
0.47

 
$
1.62

 
$
1.34