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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Computation of Income Per Share
The following table provides a reconciliation of the numerator and the denominator of the basic net income per share computation with the numerator and the denominator of the diluted net income per share computation. Prior year amounts have been restated to reflect the impact of stock dividends.
 
Year Ended December 31,
   (In thousands, except earnings per share data)
2018
 
2017
 
2016
Net income available to common shareholders
$
14,017

 
$
8,640

 
$
7,385

Weighted average shares outstanding
16,899,960

 
16,885,587

 
16,881,379

Add: dilutive effect of stock options
38,812

 
19,328

 
7,648

Weighted average shares outstanding adjusted for potential dilution
16,938,772

 
16,904,915

 
16,889,027

Basic earnings per share
$
0.83

 
$
0.51

 
$
0.44

Diluted earnings per share
$
0.83

 
$
0.51

 
$
0.44

Anti-dilutive shares excluded from earnings per share calculation
84,000

 
98,000

 
21,000