Derivative Financial Instruments Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral		$ 4,779	$ 2,495
Derivative Asset		133,158	38,847
Derivative Liability, Fair Value, Amount Offset Against Collateral		4,779	2,495
Derivative Liability		$ 7,163	36,515
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	$ 299		0
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	432		2,497
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	329		756
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	389		827
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	6,710		2,566
Derivative Asset, Fair Value, Gross Asset	13,012		9,928
Derivative Asset, Fair Value, Amount Offset Against Collateral	12,879		7,431
Derivative Asset	133		2,497
Derivative Liability, Fair Value, Amount Offset Against Collateral	6,650		2,495
Derivative Liability	$ 60		$ 71

Fair value, after effects of master netting arrangements, deduction of assets not subject to a master netting arrangement and elected not to be offset, 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.

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