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Derivative Activities (Narratives) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Unrealized Gain Loss On Derivatives $ 1,000 $ 4,300
Notional Amount Purchased Option   3,400
Embedded Derivative, Fair Value of Embedded Derivative Liability   1,100
Derivative Assets 1,330 3,025
Derivative Liabilities 2,437 6,162
Notional Amount Embedded Option   3,200
Derivative, Notional Amount 136,100 109,800
Interest Rate Cap [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Derivative Assets 143 32
Derivative Liabilities 139 32
Options tied to Standard & Poor 500 Stock Market Index [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Derivative Assets 0 1,170
Designated as Hedging Instrument [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Derivative Liabilities 1,004 4,307
Not Designated as Hedging Instrument [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Derivative Assets 1,187 1,819
Derivative Liabilities 1,187 1,819
Other derivative    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Derivative Assets 0 4
Derivative Liabilities $ 107 $ 4