Derivatives and Hedging Activities - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative assets
Gross Amounts	$ 105,185	$ 38,447
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts	105,185	38,447
Gross Amounts not Offset in the Balance Sheet	(86,858)	(35,100)
Net	18,327	3,347
Derivative liabilities
Gross Amounts	181,461	415,628
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts	181,461	415,628
Gross Amounts not Offset in the Balance Sheet	(86,858)	(35,100)
Net	$ 94,603	$ 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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Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after effects of master netting arrangements, of 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 offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after effects of master netting arrangements, of 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 offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of asset associated with 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.

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