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Derivative and Hedging Activities - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative [Line Items]
Interest income	$ 265,872,000	$ 237,690,000	$ 510,339,000	$ 479,015,000
Derivative Liabilities	0		0
Gain (losses) on interest rate derivatives designated as cash flow hedge			828,000,000
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	15,900,000		15,900,000
Interest Rate Swap | Cash Flow Hedging
Derivative [Line Items]
Derivative, notional amount	2,250,000,000		2,250,000,000		$ 800,000,000
Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	2,000,000,000.0		2,000,000,000.0		$ 2,000,000,000.0
Interest income	7,900,000	$ 207,000	11,800,000	$ 446,000
Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount	2,000,000,000.0		2,000,000,000.0
LCH | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount	$ 4,300,000,000		$ 4,300,000,000

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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