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Pension Plans (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
Pension Plan
        
Service cost - benefits earned during the period $ 457 $ 478 $ 1,061 $ 956
Interest cost 363 432 799 864
Expected return on plan assets (492) (444) (984) (888)
Amortization of transition obligation 1 1 2 2
Amortization of net (gain)/loss 136 114 403 228
Amortization of prior service cost 3 3 6 6
Net periodic pension cost 468 584 1,287 1,168
SERP
        
Service cost - benefits earned during the period 76 115 170 230
Interest cost 70 102 157 204
Expected return on plan assets            
Amortization of transition obligation            
Amortization of net (gain)/loss    26 34 52
Amortization of prior service cost 5 5 10 10
Net periodic pension cost 151 248 371 496
2012 Total Both Plans
        
Service cost - benefits earned during the period 533   1,231  
Interest cost 433   956  
Expected return on plan assets (492)   (984)  
Amortization of transition obligation 1   2  
Amortization of net (gain)/loss 136   437  
Amortization of prior service cost 8   16  
Net periodic pension cost 619   1,658  
2011 Total Both Plans
        
Service cost - benefits earned during the period   593   1,186
Interest cost   534   1,068
Expected return on plan assets   (444)   (888)
Amortization of transition obligation   1   2
Amortization of net (gain)/loss   140   280
Amortization of prior service cost   8   16
Net periodic pension cost   $ 832   $ 1,664