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Derivative Activities (Derivative Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets $ 15,861 $ 20,502
Derivative Liabilities 13,830 14,937
Options tied to Standard & Poor 500 Stock Market Index [Member]
    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 12,555 16,430
Designated as Hedging Instrument [Member]
    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 166 850
Derivative Liabilities 10,695 11,757
Not Designated as Hedging Instrument [Member]
    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 2,755 2,861
Derivative Liabilities 2,755 2,861
Interest Rate Cap [Member]
    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 374 319
Derivative Liabilities 374 319
Other derivative
    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 11 42
Derivative Liabilities $ 6 $ 0