Derivatives and Hedging Activities - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative assets
Gross Amounts	$ 154,394	$ 73,074
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts	154,394	73,074
Gross Amounts not Offset in the Balance Sheet	(6,307)	(6,517)
Net	148,087	66,557
Derivative liabilities
Gross Amounts	8,203	9,740
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts	8,203	9,740
Gross Amounts not Offset in the Balance Sheet	(6,307)	(6,517)
Net	$ 1,896	$ 3,223

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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