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Derivative Activities (Derivative Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Derivative Assets (Liabilities) at Fair Value    
Derivative Assets $ 898 $ 771
Derivative Liabilities 752 1,281
Designated as Hedging Instrument [Member]    
Derivative Assets (Liabilities) at Fair Value    
Derivative Assets 146 0
Derivative Liabilities 0 510
Not Designated as Hedging Instrument [Member]    
Derivative Assets (Liabilities) at Fair Value    
Derivative Assets 459 618
Derivative Liabilities 459 618
Interest Rate Cap [Member]    
Derivative Assets (Liabilities) at Fair Value    
Derivative Assets 293 153
Derivative Liabilities 293 153
Other derivative    
Derivative Assets (Liabilities) at Fair Value    
Derivative Liabilities $ 0 $ 0