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Employee Benefit Plans (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss)    
Prior service costs $ (600) $ (679)
Net accumulated actuarial net loss (1,849) (2,777)
Accumulated other comprehensive loss (2,449) (3,456)
Net periodic benefit cost in excess of cumulative employer contributions (1,185) (727)
Net amount recognized at December 31, balance sheet (3,634) (4,183)
Net gain (loss) arising during period 881 (3,001)
Prior service cost amortization 79 79
Amortization of net actuarial loss 46 0
Total recognized in other comprehensive income (loss) 1,006 (2,922)
Total recognized in net periodic pension cost and other comprehensive income (loss) $ 218 $ 3,829