Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Assets
Derivatives (included in Other Assets)
Gross amounts recognized	$ 43,746	$ 82,655
Gross amounts offset	(1,569)	(4,336)
Net Amounts Presented in the Consolidated Balance Sheets	42,177	78,319
Gross amounts not offset	0	0
Net Amount	42,177	78,319
Other Liabilities
Derivatives (included in Other Liabilities)
Gross amounts recognized	44,170	82,626
Gross amounts offset	(1,616)	(3,593)
Net Amounts Presented in the Consolidated Balance Sheets	42,554	79,033
Gross amounts not offset	(43,190)	(77,930)
Net Amount	$ (636)	$ 1,103