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Offsetting of Financial Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Securities sold under agreements to repurchase    
Gross Amount of Recognized Liabilities $ 30,000 $ 30,000
Net Amount of Liabilities Presented in the Balance Sheet 30,000 30,000
Gross amount not offset in the balance sheet    
Financial Instruments $ 30,000 $ 30,000