Annual report pursuant to Section 13 and 15(d)

Supplemental Retirement Plan and Related Post Retirement Benefits (Details)

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Supplemental Retirement Plan and Related Post Retirement Benefits (Details) (SERP [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
SERP [Member]
     
Net periodic cost recognized for defined benefit plans/Accumulated Postretirement Benefit Obligation      
Beginning of the Year - January 1 $ 7,588 $ 6,141  
Adoption of SERP II 5,790    
Service Cost 303 46 38
Interest Cost 548 328 330
Actuarial Loss 1,161 1,421  
Benefits Paid (348) (348)  
End of the Year - December 31 $ 15,042 $ 7,588 $ 6,141