Derivatives (Textual) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($) derivative
Derivative [Line Items]
Maximum period in which contracts for the sale of grain to processors or other consumers extend (years)	1 year
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate contracts
Derivative [Line Items]
Number of derivative instruments held | derivative	1
Notional amount of derivative | $	$ 40