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Share-Based Compensation Plan (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of restricted share activity
The following table provides a summary of service condition restricted share activity as of December 31, 2012:
 
 
Shares
 
Weighted-Average
Grant Date
Fair Value
Unvested at January 1, 2010
15,000

 
$
20.00

Granted
70,110

 
$
20.98

Vested
(4,170
)
 
$
20.00

Forfeited
(2,500
)
 
$
20.00

Unvested at December 31, 2010
78,440

 
$
20.88

Granted
79,330

 
$
22.03

Vested
(26,874
)
 
$
20.83

Forfeited
(2,232
)
 
$
21.58

Unvested at December 31, 2011
128,664

 
$
21.59

Granted
52,545

 
$
23.15

Vested
(52,587
)
 
$
21.43

Forfeited
—

 
$
—

Unvested at December 31, 2012
128,622

 
$
22.19