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Employee Benefits (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Employee Benefits [Abstract]          
Employer's matching contribution to 401(k) of employees hired on or after January 1, 2009 (in hundredths)     50.00%    
Maximum annual contribution per employee, percent (in hundredths)     3.00%    
Automatic Annual Contribution Employees Hired After January 1, 2009 Benefit Reduction Under Certain Amendments Minimum     5.00%    
Automatic Annual Contribution Employees Hired After January 1, 2009 Due Benefit Reduction Under Certain Amendments Maximum     7.00%    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]          
Service cost $ 22 $ 22 $ 44 $ 66  
Interest cost 11 8 22 17  
Amortization of unrecognized net (gain)/loss 5 (8) 10 (12)  
Amortization of unrecognized prior service cost 7 7 14 18  
Net periodic pension cost 45 29 90 89  
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]          
Net actuarial loss 142   142   156
Past service cost 64   64   74
Total 206   206   230
Qualified Noncontributory Defined Benefit Retirement Plan [Member]
         
Defined Benefit and Contribution Plan Disclosure [Line Items]          
Pension and Other Postretirement Benefit Expense 149 134 291 258  
401 (K) [Member]
         
Defined Benefit and Contribution Plan Disclosure [Line Items]          
Pension and Other Postretirement Benefit Expense $ 74 $ 82 $ 110 $ 157