Derivative Financial Instruments Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	$ 12,318	$ 4,779
Derivative Asset	364,995	133,158
Derivative Liability, Fair Value, Amount Offset Against Collateral	12,318	4,779
Derivative Liability	907	7,163
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	487	299
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	534	432
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	111	329
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	171	389
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	18,691	6,710
Derivative Asset, Fair Value, Gross Asset	49,104	13,012
Derivative Asset, Fair Value, Amount Offset Against Collateral	49,057	12,879
Derivative Asset	47	133
Derivative Liability, Fair Value, Amount Offset Against Collateral	18,631	6,650
Derivative Liability	$ 60	$ 60