Derivative Instruments and Hedging Activities - Offsetting Derivatives (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Assets
Gross amounts recognized		$ 189,991	$ 62,436
Less: amounts offset in the Consolidated Statements of Financial Condition		0	0
Net amount presented in the Consolidated Statements of Financial Condition	[1]	189,991	62,436
Offsetting derivative positions		(7,495)	(2,674)
Cash collateral pledged		0	0
Net credit exposure		182,496	59,762
Liabilities
Gross amounts recognized		54,828	18,535
Less: amounts offset in the Consolidated Statements of Financial Condition		0	0
Net amount presented in the Consolidated Statements of Financial Condition	[1]	54,828	18,535
Offsetting derivative positions		(7,495)	(2,674)
Cash collateral pledged		(48,430)	(15,861)
Net credit exposure		$ (1,097)	$ 0

[1] Included in other assets or other liabilities in the Consolidated Statements of Financial Condition.