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Derivative and Hedging Activities - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Derivative [Line Items] |  |  |  |  |
Interest income | $ 281,886,000 | $ 235,915,000 | $ 792,225,000 | $ 714,930,000 |
Derivative Liabilities | 0 |  | 0 |  |
Gain (losses) on interest rate derivatives designated as cash flow hedge |  |  | 6,000,000.0 |  |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | 23,100,000 |  | 23,100,000 |  |
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 | 11,000,000.0 | $ 1,100,000 | 22,900,000 | $ 684,000 |
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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