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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss)    
Net of Tax $ 9,645 $ 47,962
Available-For-Sale Securities
   
Accumulated Other Comprehensive Income (Loss)    
Before Tax 13,888 95,328
Tax effect (5,403) (37,083)
Net of Tax 8,485 58,245
Derivatives Used for Cash Flow Hedges
   
Accumulated Other Comprehensive Income (Loss)    
Before Tax 1,896 (16,832)
Tax effect (736) 6,549
Net of Tax $ 1,160 $ (10,283)