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Stock Incentive Plan (Tables)
12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Compensation cost, net of forfeitures, related to stock-based compensation
The following table summarizes the compensation cost, net of forfeitures, related to stock-based compensation for the years ended December 31, 2016, 2015 and 2014 (in thousands):
 
 
2016
 
2015
 
2014
Stock and stock unit awards:
 
 
 
 
 
 
Pre-tax compensation expense
 
$
384

 
$
378

 
$
376

Income tax benefit
 
(134
)
 
(132
)
 
(132
)
Total share-based compensation expense, net of income taxes
 
$
250

 
$
246

 
$
244

Summary of option activity
A summary of option activity under the SI Plan and the 1997 Stock Incentive Plan as of December 31, 2016, 2015 and 2014, and changes during the years then ended is presented below:
 
 
2016
 
 
Shares
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining
Contractual Term
 
Aggregate
Intrinsic Value
Outstanding, beginning of year
 
45,500
 
$24.67
 
 
 
 
Granted
 
0
 
0.00
 
 
 
 
Exercised
 
(2,500)
 
24.86
 
 
 
 
Forfeited or expired
 
(2,500)
 
24.86
 
 
 
 
Outstanding, end of year
 
40,500
 
$24.65
 
1.42
 
$
378,850

Exercisable, end of year
 
40,500
 
$24.65
 
1.42
 
$
378,850



The total intrinsic value of options exercised during 2016 was $14,000. Stock options for 0 shares of common stock were not considered in computing the aggregate intrinsic value of outstanding shares and exercisable shares for 2016 because they were anti-dilutive.

 
 
2015
 
 
Shares
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining
Contractual Term
 
Aggregate
Intrinsic Value
Outstanding, beginning of year
 
52,000
 
$24.64
 
 
 
 
Granted
 
0
 
0.00
 
 
 
 
Exercised
 
0
 
0.00
 
 
 
 
Forfeited or expired
 
(6,500)
 
24.43
 
 
 
 
Outstanding, end of year
 
45,500
 
$24.67
 
2.42
 
$
63,000

Exercisable, end of year
 
45,500
 
$24.67
 
2.42
 
$
63,000



There were no options exercised during 2015. Stock options for 24,500 shares of common stock were not considered in computing the aggregate intrinsic value of outstanding shares and exercisable shares for 2015 because they were anti-dilutive.

 
 
2014
 
 
Shares
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining
Contractual Term
 
Aggregate
Intrinsic Value
Outstanding, beginning of year
 
128,750
 
$26.20
 
 
 
 
Granted
 
0
 
0.00
 
 
 
 
Exercised
 
0
 
0.00
 
 
 
 
Forfeited or expired
 
(76,750)
 
27.25
 
 
 
 
Outstanding, end of year
 
52,000
 
$24.64
 
3.43
 
$

Exercisable, end of year
 
52,000
 
$24.64
 
3.43
 
$



Stock options, by exercise price range
The following table summarizes information about stock options under the SI Plan outstanding at December 31, 2016:
 
 
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
 
Number Outstanding
 
Weighted-Average Remaining Contractual Life
 
Weighted-Average Exercise Price
 
Number Exercisable
 
Weighted-Average Exercise Price
$22.50 to $24.50
 
19,000
 
1.96
 
$23.00
 
19,000
 
$23.00
$24.50 to $26.50
 
21,500
 
0.95
 
$26.10
 
21,500
 
$26.10
 
 
40,500
 
1.42
 
$24.65
 
40,500
 
$24.65
Schedule of Unvested Restricted Stock and Restricted Stock Units Roll Forward [Table Text Block]
The following table summarizes non-vested stock and stock unit activity for the years ended December 31, 2016, 2015 and 2014:
 
 
2016
 
2015
 
2014
 
 
Shares
 
Weighted-avg Grant-date Fair Value
 
Shares
 
Weighted-avg Grant-date Fair Value
 
Shares
 
Weighted-avg Grant-date Fair Value
Nonvested, beginning of year
 
30,169
 
$20.87
 
26,897
 
$22.95
 
24,799
 
$24.16
Granted
 
13,912
 
26.09
 
18,002
 
20.14
 
19,377
 
22.00
Vested
 
(11,743)
 
22.18
 
(14,730)
 
23.77
 
(14,499)
 
23.72
Forfeited
 
0
 
0.00
 
0
 
0.00
 
(2,780)
 
23.12
Nonvested, end of year
 
32,338
 
$22.64
 
30,169
 
$20.87
 
26,897
 
$22.95
Fair value of shares vested
 
 
 
$
260,483

 
 
 
$
350,075

 
 
 
$
343,910