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Derivative Activities (Interest rate swap and their term) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Derivative [Line Items]    
Notional Amount $ 135,300 $ 136,100
Interest rate swap designated as cash flow hedges - 1 Month LIBOR    
Derivative [Line Items]    
Notional Amount 35,487  
Interest rate swap designated as cash flow hedges - 1 Month LIBOR | Rate 2.4210% [Member]    
Derivative [Line Items]    
Notional Amount $ 35,487  
Fixed rate 0.02421%  
Trade Date Jul. 03, 2013  
Settlement Date Jul. 03, 2013  
Maturity Date Aug. 01, 2023