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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The following is an analysis of basic and diluted EPS, reflecting the application of the two-class method, as described below:
 
2014
 
2013
 
2012
Net income
$
24,570

 
$
22,783

 
$
23,428

Dividends and undistributed earnings allocated to participating securities(1)
(75
)
 
(64
)
 
(60
)
Net income available to common shareholders
$
24,495

 
$
22,719

 
$
23,368

Weighted-average common shares outstanding for basic EPS
7,450,980

 
7,634,455

 
7,646,861

Dilutive effect of stock-based awards( 2)
19,613

 
18,815

 
14,412

Weighted-average common and potential common shares for diluted EPS
7,470,593

 
7,653,270

 
7,661,273

Earnings per common share:
  

 
  

 
  

Basic EPS
$
3.29

 
$
2.98

 
$
3.06

Diluted EPS
3.28

 
2.97

 
3.05

Awards excluded from the calculation of diluted EPS(3):
 
 
 
 
 
Stock options
36,250

 
15,250

 
49,500

(1) Represents dividends paid and undistributed earnings allocated to nonvested stock-based awards that contain non-forfeitable rights to dividends.
(2) Represents the effect of the assumed exercise of stock options, vesting of restricted shares, vesting of restricted stock units, and vesting of LTIP awards that have met the performance criteria, utilizing the treasury stock method.
(3) Represents stock-based awards not included in the computation of potential common shares for purposes of calculating diluted EPS, as the exercise prices were greater than the average market price of the Company's common stock.