Derivatives and Hedging Activities - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Derivative assets
Gross Amounts	$ 224,453	$ 76,640
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts	224,453	76,640
Gross Amounts not Offset in the Balance Sheet	(85,190)	(37,820)
Net	139,263	38,820
Derivative liabilities
Gross Amounts	88,477	45,832
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts	88,477	45,832
Gross Amounts not Offset in the Balance Sheet	(85,190)	(37,820)
Net	$ 3,287	$ 8,012