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Employee Benefit Plans (Details 8)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted average discount rate 4.25% 4.75% 5.75%
Rate of increase in compensation levels 3.75% 4.00% 4.00%
Supplemental Executive Retirement Plan [Member]
     
Weighted average discount rate 4.00% 4.50% 5.50%
Rate of increase in compensation levels 3.75% 4.00% 4.00%