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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
Mar. 31, 2013
Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income $ 0 $ 0
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) 120 35
Interest rate swap contracts [Member] | Other Comprehensive Income [Member] | Cash Flow Hedge [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) 120 35
Interest rate swap contracts [Member] | Interest Expense [Member] | Cash Flow Hedge [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income $ 0 $ 0