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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Basic earnings per common share computation:
 
 
 
 
 
 
 
Net income per consolidated statements of income
$
8,441

 
$
6,683

 
$
15,538

 
$
13,163

Net earnings allocated to participating securities
(39
)
 
(40
)
 
(73
)
 
(78
)
Net earnings allocated to common stock
$
8,402

 
$
6,643

 
$
15,465

 
$
13,085

Distributed earnings allocated to common stock
$
2,510

 
$
2,507

 
$
5,019

 
$
5,015

Undistributed earnings allocated to common stock
5,892

 
4,136

 
10,446

 
8,070

Net earnings allocated to common stock
$
8,402

 
$
6,643

 
$
15,465

 
$
13,085

Weighted average common shares outstanding, including shares considered participating securities
15,286

 
15,294

 
15,279

 
15,138

Less: Average participating securities
(69
)
 
(88
)
 
(70
)
 
(87
)
Weighted average shares
15,217

 
15,206

 
15,209

 
15,051

Basic earnings per common share
$
0.55

 
$
0.44

 
$
1.02

 
$
0.87

Diluted earnings per common share computation:
 
 
 
 
 
 
 
Net earnings allocated to common stock
$
8,402

 
$
6,643

 
$
15,465

 
$
13,085

Weighted average shares and dilutive potential common shares
15,217

 
15,206

 
15,209

 
15,051

Diluted earnings per common share
$
0.55

 
$
0.44

 
$
1.02

 
$
0.87