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Derivative Financial Instruments and Repurchase Agreements (Details) - Derivatives not designated as hedging instruments [Member] - Interest rate contracts [Member] - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Other Assets [Member]    
Fair value of the Company's derivative financial instruments, as well as their classification on the balance sheet    
Asset Derivatives $ 1,415 $ 698
Other Liabilities [Member]    
Fair value of the Company's derivative financial instruments, as well as their classification on the balance sheet    
Liability Derivatives $ 1,415 $ 698