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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income    
Net of tax amount $ 22,675 $ 9,645
Available-For-Sale Securities
   
Accumulated Other Comprehensive Income    
Before tax amount 46,623 13,888
Tax effect (18,090) (5,403)
Net of tax amount 28,533 8,485
Derivatives Used for Cash Flow Hedges
   
Accumulated Other Comprehensive Income    
Before tax amount (9,572) 1,896
Tax effect 3,714 (736)
Net of tax amount $ (5,858) $ 1,160