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Benefit Plans (Schedule Of Assumptions Used) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Assumptions used to determine benefit obligations as of measurement date: Discount rate 4.76% 3.89% 4.18%
Assumptions used to determine benefit obligations as of measurement date: Rate of compensation increase 4.00% 4.00% 4.00%
Assumptions used to determine net periodic benefit cost: Discount rate 3.89% 4.18% 5.28%
Assumptions used to determine net periodic benefit cost: Expected long-term return on plan assets 7.00% 7.00% 7.50%
Assumptions used to determine net periodic benefit cost: Rate of compensation increase 4.00% 4.00% 4.50%
Asset allocations as of measurement date: 100.00% 100.00% 100.00%
Shares of the Corporation's common stock held in the plan, Value of shares (in thousands) $ 49 $ 40 $ 36
Shares of the Corporation's common stock held in the plan, Percent of total plan assets 0.30% 0.20% 0.30%
Cash And Cash Equivalents [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Asset allocations as of measurement date: 10.00% 35.00% 3.00%
Equity Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Asset allocations as of measurement date: 33.00% 22.00% 25.00%
Corporate Debt Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Asset allocations as of measurement date: 6.00% 3.00% 7.00%
Municipal Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Asset allocations as of measurement date: 43.00% 38.00% 62.00%
Investment Fund-Debt [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Asset allocations as of measurement date: 7.00%    
Insurance contracts [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Asset allocations as of measurement date: 1.00% 2.00% 3.00%