Derivatives and Hedging Activities - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivative assets
Gross Amounts	$ 190,938	$ 38,447
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts	190,938	38,447
Gross Amounts not Offset in the Balance Sheet	(88,534)	(35,100)
Net	102,404	3,347
Derivative liabilities
Gross Amounts	93,401	415,628
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts	93,401	415,628
Gross Amounts not Offset in the Balance Sheet	(88,534)	(35,100)
Net	$ 4,867	$ 380,528

Derivative Asset, Subject to Master Netting Arrangement

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Derivative Liability, Subject to Master Netting Arrangement

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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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Fair value of liability associated with financial asset or other 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.

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