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Derivative Activities (Derivative Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets $ 2,662 $ 3,025
Derivative Liabilities 6,220 6,162
Options tied to Standard & Poor 500 Stock Market Index [Member]    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 772 1,170
Designated as Hedging Instrument [Member]    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Liabilities 4,318 4,307
Not Designated as Hedging Instrument [Member]    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 1,829 1,819
Derivative Liabilities 1,829 1,819
Interest Rate Cap [Member]    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 61 32
Derivative Liabilities 61 32
Other derivative    
Derivative Assets Liabilities At Fair Value Net [Line Items]    
Derivative Assets 0 4
Derivative Liabilities $ 12 $ 4