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Derivative Activities (Derivative Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivative Assets (Liabilities) at Fair Value    
Derivative Assets $ 809 $ 1,330
Derivative Liabilities 1,677 2,437
Designated as Hedging Instrument [Member]    
Derivative Assets (Liabilities) at Fair Value    
Derivative Liabilities 868 1,004
Not Designated as Hedging Instrument [Member]    
Derivative Assets (Liabilities) at Fair Value    
Derivative Assets 757 1,187
Derivative Liabilities 757 1,187
Interest Rate Cap [Member]    
Derivative Assets (Liabilities) at Fair Value    
Derivative Assets 52 143
Derivative Liabilities 52 139
Other derivative    
Derivative Assets (Liabilities) at Fair Value    
Derivative Liabilities $ 0 $ 107