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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2012
Class of Stock [Line Items]  
Schedule of Stockholders Equity [Table Text Block]
A summary of the changes in the common stock accounts for the period January 1, 2010 through December 31, 2012, appears below:

(in thousands, except share data)
Shares
 
Issuance Amount
 
Expense
 
Total
Balance, January 1, 2010
8,573,744

 
$
68,896

 
$
(1,610
)
 
$
67,286

Stock and equivalents issued through Performance Stock Program, Net of Forfeitures
31,282

 
1,077

 
—

 
1,077

Dividend Reinvestment Plan
57,749

 
1,358

 
—

 
1,358

Stock Options Exercised and Expensed
14,074

 
305

 
(2
)
 
303

Balance, December 31, 2010
8,676,849

 
$
71,636

 
$
(1,612
)
 
$
70,024

Stock and equivalents issued through Performance Stock Program, Net of Forfeitures
20,210

 
824

 
—

 
824

Dividend Reinvestment Plan
52,668

 
1,346

 
—

 
1,346

Stock Options Exercised and Expensed
5,671

 
152

 
(1
)
 
151

Balance, December 31, 2011
8,755,398

 
$
73,958

 
$
(1,613
)
 
$
72,345

Stock and equivalents issued through Performance Stock Program, Net of Forfeitures
34,301

 
1,213

 
—

 
1,213

Dividend Reinvestment Plan
50,048

 
1,486

 
—

 
1,486

Stock Options Exercised and Expensed
23,235

 
665

 
(3
)
 
662

Shares issued to acquire BSWC
380,254

 
12,012

 
(154
)
 
11,858

Shares issued in stock offering
1,696,250

 
49,615

 
(2,306
)
 
47,309

Balance, December 31, 2012 (1)
10,939,486

 
$
138,949

 
$
(4,076
)
 
$
134,873