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Employee Benefit Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Change in projected benefit obligation:    
Balance, January 1 $ 14,217 $ 10,655
Service cost 1,168 931
Interest cost 667 604
Actuarial (gain) loss (458) 2,240
Benefits paid (252) (213)
Balance, December 31 15,342 14,217
Change in plan assets:    
Fair value, January 1 10,034 9,296
Actual gain (loss) return on plan assets 1,193 (54)
Employer contribution 766 1,005
Expenses paid (34) 0
Benefits paid (252) (213)
Fair value, December 31 11,707 10,034
Funded status at end of year (3,635) (4,183)
Accumulated benefit obligation $ 12,564 $ 10,762