Derivative Instruments - Non-hedge Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Derivative [Line Items]
Notional Amount					$ 1,300,000
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	$ 3,070,594		$ 3,070,594		2,592,778
Estimated Fair Value	(1,480)		(1,480)		(208)
Derivative, Gain (Loss) on Derivative, Net	$ (135)	$ (44)	$ (1,272)	$ (146)
Not Designated as Hedging Instrument | Assets
Derivative [Line Items]
Description of Location of Interest Rate Derivatives on Balance Sheet	Other assets		Other assets
Notional Amount	$ 1,535,297		$ 1,535,297		1,296,389
Estimated Fair Value	$ 115,078		$ 115,078		43,507
Not Designated as Hedging Instrument | Liabilities
Derivative [Line Items]
Description of Location of Interest Rate Derivatives on Balance Sheet	Other liabilities		Other liabilities
Notional Amount	$ 1,535,297		$ 1,535,297		1,296,389
Estimated Fair Value	$ (116,558)		$ (116,558)		$ (43,715)