Derivatives, Hedging Activities, and Other Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative [Line Items]
Collateral already posted, fair value	$ 58,300		$ 58,300		$ 13,700
Derivative liability	56,300		56,300		10,700
Interest Rate Swap
Derivative [Line Items]
Income (expense) in fair value adjustments	46	$ 141	349	$ 195
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	$ 615,600		$ 615,600		$ 337,600