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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash Flow Hedges
Interest expense	$ 136,020	$ 176,854	$ 310,837	$ 341,026
Trading
Total	6,802	15,102	53,144	16,675
Designated as Hedging Instrument
Fair Value Hedges
Interest recognized on derivatives	19,433	(4,061)	24,056	(7,888)
Hedged items recorded in interest expense	2,296	(57,717)	(140,952)	(81,703)
Derivatives recorded in interest expense	(2,855)	57,449	141,328	81,337
Trading
Total	18,874	(4,329)	24,432	(8,254)
Designated as Hedging Instrument | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income
Cash Flow Hedges
Interest expense	(4,219)	1,189	(5,747)	2,485
Trading
Trading
Change in fair value of future interest payments recorded in earnings	(7,853)	18,242	34,459	22,444
Total	$ (7,853)	$ 18,242	$ 34,459	$ 22,444

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Derivative Instruments Increase (Decrease) In Fair Value Of Future Interest Payments Recorded In Earnings

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