Derivative Instruments and Hedging Activities - Offsetting Assets and Liabilities (Details) - Pro Forma - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative assets
Gross Amounts of Recognized Assets/ Liabilities	$ 4,079	$ 2,508
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet	4,079	2,508
Gross Amounts Not Offset in the Consolidated Balance Sheet
Derivative Financial Instruments	(2,255)	(596)
Cash Collateral Received (Pledged)	0	0
Net Amount	1,824	1,912
Derivative liabilities
Gross Amounts of Recognized Assets/ Liabilities	(8,364)	(1,697)
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet	(8,364)	(1,697)
Gross Amounts Not Offset in the Consolidated Balance Sheet
Derivative Financial Instruments	2,255	596
Cash Collateral Received (Pledged)	0	0
Net Amount	$ (6,109)	$ (1,101)