Derivative Activities (Interest rate swap and their term) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional Amount	$ 135,600	$ 136,100
Interest rate swap designated as cash flow hedges - 1 Month LIBOR
Derivative [Line Items]
Notional Amount	35,856
Interest rate swap designated as cash flow hedges - 1 Month LIBOR | Rate 2.4210% [Member]
Derivative [Line Items]
Notional Amount	$ 35,856
Fixed rate	0.02421%
Trade Date	Jul. 03, 2013
Settlement Date	Jul. 03, 2013
Maturity Date	Aug. 01, 2023