Annual report pursuant to Section 13 and 15(d)

Other Benefit Plans (Details)

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Other Benefit Plans (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
401I(k) plan contributions by employer $ 467,000 $ 529,000 $ 454,000
Deferred Compensation Liability 1,314,000 1,221,000  
Accrued benefit liability, prior CEO 1,400,000 1,500,000  
Prior CEO SERP current service cost 106,000 113,000 119,000
Officer SERP current service cost 342,000 334,000 344,000
Officer [Member]
     
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Accrued benefit liability $ 2,300,000 $ 1,700,000