Derivative Activities (Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative Assets (Liabilities) at Fair Value
Derivative Assets	$ 771	$ 1,330
Derivative Liabilities	1,281	2,437
Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities) at Fair Value
Derivative Liabilities	510	1,004
Not Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities) at Fair Value
Derivative Assets	618	1,187
Derivative Liabilities	618	1,187
Interest Rate Cap [Member]
Derivative Assets (Liabilities) at Fair Value
Derivative Assets	153	143
Derivative Liabilities	153	139
Other derivative
Derivative Assets (Liabilities) at Fair Value
Derivative Liabilities	$ 0	$ 107