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Interest Rate Swap Derivatives (Details 3) - Interest Rate Swap [Member] - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Gross Amount of Recognized Assets $ 873 $ 3,781
Net amounts of assets presented in the balance sheet 873 3,781
Gross amounts not offset in the balance sheet net amount 873 3,781
Counter Party 1 [Member]    
Gross Amount of Recognized Assets 944 2,948
Net amounts of assets presented in the balance sheet 944 2,948
Gross amounts not offset in the balance sheet net amount 944 2,948
Counter Party 3 [Member]    
Gross Amount of Recognized Assets (71) (59)
Net amounts of assets presented in the balance sheet (71) (59)
Gross amounts not offset in the balance sheet net amount $ (71) (59)
Counter Party 2 [Member]    
Gross Amount of Recognized Assets   892
Net amounts of assets presented in the balance sheet   892
Gross amounts not offset in the balance sheet net amount   $ 892