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Financial Derivatives - Schedule of Derivative Instruments, Impact on Results of Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ (8,800) $ (16,400) $ (22,800)
Gains on financial derivatives and hedging activities 753 2,311 2,531
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge (2,413) (20,322) 3,100
Gain (Loss) on Fair Value Hedges Recognized in Earnings (719) 5,043 9,065
Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains on financial derivatives and hedging activities 1,792 (2,379) (5,983)
Interest Rate Swap [Member] | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) on Components Included from Assessment of Interest Rate Fair Value Hedge Effectiveness (100) 5,200 9,200
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net 600 200 100
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments 1,694 25,365 5,965
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness (320) (353) (551)
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net (320) (353) (551)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains on financial derivatives and hedging activities 2,040 (1,991) (3,204)
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains on financial derivatives and hedging activities (588) (226) (2,440)
Future [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains on financial derivatives and hedging activities $ 340 $ (162) $ (339)