Interest Rate Swap Derivatives (Details 3) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Gross Amount of Recognized Assets	$ 4,788	$ 2,256
Interest Rate Swap [Member]
Gross Amount of Recognized Assets	4,779
Gross amounts of recognized liabilities		2,201
Net amounts of assets presented in the balance sheet	4,779
Net amounts of liabilities presented in the balance sheet		2,201
Gross amounts not offset in the balance sheet net amount	4,779
Gross amounts not offset in the balance sheet net amount		2,201
Counter Party 1 [Member] | Interest Rate Swap [Member]
Gross Amount of Recognized Assets	3,706
Gross amounts of recognized liabilities		1,619
Net amounts of assets presented in the balance sheet	3,706
Net amounts of liabilities presented in the balance sheet		1,619
Gross amounts not offset in the balance sheet net amount	3,706
Gross amounts not offset in the balance sheet net amount		1,619
Counter Party 2 [Member] | Interest Rate Swap [Member]
Gross Amount of Recognized Assets	1,073
Gross amounts of recognized liabilities		582
Net amounts of assets presented in the balance sheet	1,073
Net amounts of liabilities presented in the balance sheet		582
Gross amounts not offset in the balance sheet net amount	$ 1,073
Gross amounts not offset in the balance sheet net amount		$ 582