Derivative Instruments and Hedging Activities - Offsetting Derivatives (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Assets
Gross amounts recognized		$ 182,753	$ 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]	182,753	62,436
Offsetting derivative positions		(8,062)	(2,674)
Cash collateral pledged		0	0
Net credit exposure		174,691	59,762
Liabilities
Gross amounts recognized		53,877	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]	53,877	18,535
Offsetting derivative positions		(8,062)	(2,674)
Cash collateral pledged		(44,798)	(15,861)
Net credit exposure		$ 1,017	$ 0

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