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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Trading
Total	$ 136	$ (15)	$ 3,751	$ 45,672	$ (3,635)	$ 1,961	$ 16,736	$ 2,763
Interest Rate Swaps
Trading
Total									$ 66,164	$ 12,789	$ (14,340)
Interest Rate Swaps | Designated as Hedging Instrument | Fair Value
Fair Value Hedges
Interest recognized on derivatives									71,668	(8,806)	(11,642)
Hedged items recorded in interest expense									(91,087)	(77,350)	(7,966)
Derivatives recorded in interest expense									91,419	77,177	8,123
Trading
Total									72,000	(8,979)	(11,485)
Interest Rate Swaps | Designated as Hedging Instrument | Cash Flow
Cash Flow Hedges
Amount of gain (loss) reclassified from accumulated other comprehensive income into interest expense									(16,000)	2,299	(1,455)
Trading
Total									(16,000)	2,299	(1,455)
Interest Rate Swaps | Trading
Trading
Change in fair value of future interest payments recorded in earnings									10,164	19,469	(1,400)
Total									$ 10,164	$ 19,469	$ (1,400)

X

- Definition

Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Hedge Ineffectiveness

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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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