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Interest Rate Swap Derivatives - Liabilities subject to master netting arrangement (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Gross Amount of Recognized Assets $ 311 $ 59
Gross Amount of Recognized Liabilities 611  
Net amounts of assets presented in the balance sheet 311  
Net amounts of liabilities presented in the balance sheet 611  
Gross amounts not offset in the balance sheet cash collateral 500  
Gross amounts not offset in the balance sheet net amount 311  
Gross amounts not offset in the balance sheet net amount 111  
Interest Rate Swap    
Net amounts of assets presented in the balance sheet   3,727
Net amounts of liabilities presented in the balance sheet $ 203  
Derivative Instrument    
Gross Amount of Recognized Assets   3,840
Gross Amount of Recognized Liabilities   59
Net amounts of assets presented in the balance sheet   3,840
Net amounts of liabilities presented in the balance sheet   59
Gross amounts not offset in the balance sheet net amount   3,840
Gross amounts not offset in the balance sheet net amount   $ 59