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Derivatives, Derivatives Instruments Gain (Loss) in Income Statement (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue $ 42,603 $ 40,714 $ 37,800
Gain (Loss) on Derivatives, Net (15,685) 430 2,776
To-be-announced residential mortgage-backed securities [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 38,523 33,877 27,007
Gain (Loss) on Derivatives, Net 0 0 0
Interest rate swaps [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 2,589 2,066 2,494
Gain (Loss) on Derivatives, Net 0 0 0
Energy contracts [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 5,027 4,060 6,572
Gain (Loss) on Derivatives, Net 0 0 0
Agricultural contracts [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 111 123 146
Gain (Loss) on Derivatives, Net 0 0 0
Foreign exchange contracts [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 945 797 1,581
Gain (Loss) on Derivatives, Net 0 0 0
Equity option contracts [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 0 0 0
Gain (Loss) on Derivatives, Net 0 0 0
Customer risk management programs [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 47,195 40,923 37,800
Gain (Loss) on Derivatives, Net 0 0 0
Internal risk management programs [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue (4,592) (209) 0
Gain (Loss) on Derivatives, Net $ (15,685) $ 430 $ 2,776