Financial Derivatives - Hedging Description (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ (4,500)	$ (5,500)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	500	119
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	1,800
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net of Tax	$ 1,100
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge	10 years
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	$ 0	$ 0