Derivative Financial Instruments Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	$ 12,212	$ 4,779
Derivative Asset	355,222	133,158
Derivative Liability, Fair Value, Amount Offset Against Collateral	12,212	4,779
Derivative Liability	1,154	7,163
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	143	299
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	963	432
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0	329
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	363	389
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	18,012	6,710
Derivative Asset, Fair Value, Gross Asset	46,762	13,012
Derivative Asset, Fair Value, Amount Offset Against Collateral	45,942	12,879
Derivative Asset	820	133
Derivative Liability, Fair Value, Amount Offset Against Collateral	17,649	6,650
Derivative Liability	$ 363	$ 60