Derivatives and Hedging Activities - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative assets
Gross Amounts	$ 119,426	$ 76,640
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts	119,426	76,640
Gross Amounts not Offset in the Balance Sheet	(60,426)	(37,820)
Net	59,000	38,820
Derivative liabilities
Gross Amounts	92,804	45,832
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts	92,804	45,832
Gross Amounts not Offset in the Balance Sheet	(60,426)	(37,820)
Net	$ 32,378	$ 8,012