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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flow Hedges
Interest expense	$ 105,044	$ 174,817
Trading
Total	6,501	46,342
Designated as Hedging Instrument
Fair Value Hedges
Interest recognized on derivatives	22,610	4,623
Hedged items recorded in interest expense	31,275	(143,248)
Derivatives recorded in interest expense	(31,251)	144,183
Trading
Total	22,634	5,558
Designated as Hedging Instrument | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income
Cash Flow Hedges
Interest expense	(5,269)	(1,528)
Trading
Trading
Change in fair value of future interest payments recorded in earnings	(10,864)	42,312
Total	$ (10,864)	$ 42,312

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