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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 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. There were no anti-dilutive stock options for the years ended December 31, 2018, 2017, and 2016. 
 
Years Ended December 31,
 
2018
 
2017
 
2016
Basic earnings per common share computation
 
 
 
 
 
Net income per consolidated statements of income
$
33,719

 
$
23,860

 
$
20,540

Net earnings allocated to participating securities
(150
)
 
(135
)
 
(129
)
Net earnings allocated to common stock
$
33,569

 
$
23,725

 
$
20,411

Distributed earnings allocated to common stock
$
10,186

 
$
10,030

 
$
9,480

Undistributed earnings allocated to common stock
23,383

 
13,695

 
10,931

Net earnings allocated to common stock
$
33,569

 
$
23,725

 
$
20,411

Weighted average common shares outstanding, including shares considered participating securities
15,274

 
15,212

 
14,457

Less: Average participating securities
(64
)
 
(80
)
 
(82
)
Weighted average shares
15,210

 
15,132

 
14,375

Basic earnings per common share
$
2.21

 
$
1.57

 
$
1.42

Diluted earnings per common share computation
 
 
 
 
 
Net earnings allocated to common stock
$
33,569

 
$
23,725

 
$
20,411

Weighted average common shares outstanding for basic earnings per common share
15,210

 
15,132

 
14,375

Add: Dilutive effects of assumed exercises of stock options
0

 
0

 
0

Weighted average shares and dilutive potential common shares
15,210

 
15,132

 
14,375

Diluted earnings per common share
$
2.21

 
$
1.57

 
$
1.42