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Pension and Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Pension plan [Member]
    
Pension plan:    
Service cost $ 17 $ 15
Interest cost 78 82
Expected return on plan assets (102) (94)
Amortization of net actuarial loss 92 83
Net periodic benefit cost 85 86
Health care plan [Member]
    
Pension plan:    
Interest cost 1 1
Amortization of gain (4) (2)
Net periodic benefit cost $ (3) $ (1)