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Executive Benefit Agreements and Employee Savings Plans (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Death Benefit Agreement [Line Items]    
Accrued death benefits - All agreements $ 4,017 $ 4,058
Total undiscounted executive benefits - 1992 Agreements 1,950 1,963
Discount rates utilized - 1992 Agreements 3.58% 4.17%
Accrued executive benefits - 1992 Agreements 1,262 1,187
Death Benefit 1981 Agreements [Member]
    
Death Benefit Agreement [Line Items]    
Undiscounted death benefits 4,115 4,115
Death Benefit 1992 Agreements [Member]
    
Death Benefit Agreement [Line Items]    
Undiscounted death benefits 302 302
Death Benefit 2005 Agreement [Member]
    
Death Benefit Agreement [Line Items]    
Undiscounted death benefits $ 2,500 $ 2,500