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Derivative Activities (Derivative Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets $ 3,290 $ 8,107
Derivative Liabilities 8,622 11,221
Options tied to Standard & Poor 500 Stock Market Index [Member]    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 1,115 5,555
Designated as Hedging Instrument [Member]    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Liabilities 6,395 8,585
Not Designated as Hedging Instrument [Member]    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 2,139 2,399
Derivative Liabilities 2,139 2,399
Interest Rate Cap [Member]    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 36 152
Derivative Liabilities 36 152
Other derivative    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 0 1
Derivative Liabilities $ 52 $ 85