Derivative Instruments and Hedging Activities - Other Derivative Instruments (Details) - Other Derivative Instruments - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Gross notional amount outstanding		$ 4,589,018	$ 4,340,384
Derivative asset fair value in other assets	[1]	183,938	61,709
Derivative liability fair value in other liabilities	[1]	(55,026)	(18,416)
Fair value of derivative	[2]	$ 56,025	$ 18,856

[1] Certain other derivative instruments are centrally cleared and their change in fair value is settled by the counterparties to the transaction, which results in no fair value.

[2] This amount represents the fair value if credit risk related contingent features were triggered.