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Employee Benefit Plans (Details 2) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Components of net pension cost        
Pension expense $ 286,000 $ 330,000 $ 572,000 $ 660,000
Pension
        
Defined Benefit Plan Disclosure        
Minimum required contribution     665,000  
Components of net pension cost        
Service cost-benefits earned during the year       1,168,000
Interest costs on projected benefit obligations       668,000
Expected return on plan assets       (776,000)
Expected administrative expenses       40,000
Amortization of prior service cost       78,000
Amortization of unrecognized net loss       46,000
Net periodic pension expense       1,224,000
Pension expense 286,000 330,000 572,000 660,000
Estimated | Pension
        
Components of net pension cost        
Service cost-benefits earned during the year     1,211,000  
Interest costs on projected benefit obligations     645,000  
Expected return on plan assets     (820,000)  
Amortization of prior service cost     78,000  
Amortization of unrecognized net loss     30,000  
Net periodic pension expense     $ 1,144,000