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Derivative Financial Instruments (Derivatives in Cash Flow Hedging Relationships, Effect in Statements of Income and Changes in Shareholders' Equity) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income $ 0 $ 0 $ 0 $ 0
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) 152 (16) 272 19
Interest rate swap contracts [Member] | Cash Flow Hedge [Member] | Interest Expense [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income 0 0 0 0
Interest rate swap contracts [Member] | Cash Flow Hedge [Member] | Other Comprehensive Income (Loss) [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) $ 152 $ (16) $ 272 $ 19