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Stock Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation [Abstract]  
Transactions of the Company's stock option plans
The following table summarizes the transactions of the Company’s stock option plans for the three-year period ended December 31, 2012: 
 
Number of shares
 
Weighted-average
exercise price
Options outstanding —
 
 
 
December 31, 2009
264,010

 
$
21.44

Options granted
36,000

 
$
38.41

Options exercised
(48,760
)
 
$
7.42

Options outstanding —
 
 
 
December 31, 2010
251,250

 
$
26.59

Options granted
31,500

 
$
36.59

Options exercised
(33,180
)
 
$
7.07

Options forfeited
(4,480
)
 
$
38.20

Options outstanding —
 
 
 
December 31, 2011
245,090

 
$
30.30

Options granted
45,100

 
$
36.15

Options exercised
(37,450
)
 
$
10.25

Options forfeited
(5,160
)
 
$
37.19

Options outstanding —
 
 
 
December 31, 2012
247,580

 
$
34.26

Price range $7.00 — $31.41
 
 
 
(weighted-average contractual life of 2.7 years)
69,920

 
$
21.39

Price range $31.42 — $38.41
 
 
 
(weighted-average contractual life of 8.4 years)
109,960

 
$
36.99

Price range $38.42 — $52.81
 
 
 
(weighted-average contractual life of 6.0 years)
67,700

 
$
43.13

Exercisable options —
 
 
 
December 31, 2010
144,022

 
$
17.92

December 31, 2011
152,762

 
$
25.29

December 31, 2012
141,740

 
$
31.72
Assumptions used for valuing options
The following assumptions were used for valuing options granted in the years ended December 31:
 
2012
 
2011
Per share fair value of options granted during the period
$13.17
 
$9.80
Risk-free interest rate
0.85
%
 
1.98
%
Dividend yield
1.77
%
 
1.48
%
Volatility factor
49.7
%
 
48.0
%
Weighted-average expected life in years
5.3

 
2.3
Aggregate intrinsic value related to stock options
The following table summarizes the aggregate intrinsic value related to options exercised, outstanding and exercisable as of and for the years ended December 31:
 
2012
 
2011
 
(In thousands)
Exercised
$
950

 
$
560

Outstanding
$
3,371

 
$
1,332

Exercisable
$
2,316

 
$
1,312
Transactions of the Company's restricted stock
The fair value of nonvested shares is determined based on the market price of the shares on the grant date.
 
Shares
 
Fair value
per share
Nonvested at December 31, 2009
46,600

 
$
37.09

Granted
18,500

 
$
38.41

Vested
(15,800
)
 
$
24.94

Forfeited
(1,400
)
 
$
39.28

Nonvested at December 31, 2010
47,900

 
$
41.52

Granted
28,650

 
$
36.59

Vested
(10,900
)
 
$
51.26

Forfeited
(2,350
)
 
$
39.30

Nonvested at December 31, 2011
63,300

 
$
37.69

Granted
30,325

 
$
36.15

Vested
(17,900
)
 
$
38.69

Forfeited
(1,900
)
 
$
21.77

Nonvested at December 31, 2012
73,825

 
$
37.01