Derivative Instruments and Hedging Activities - Offsetting Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Gross amounts recognized	$ 153,704	$ 62,436
Less: amounts offset in the Consolidated Statements of Financial Condition	0	0
Net amount presented in the Consolidated Statements of Financial Condition	153,704	62,436
Offsetting derivative positions	(5,239)	(2,674)
Cash collateral pledged	0	0
Net credit exposure	148,465	59,762
Liabilities
Gross amounts recognized	44,581	18,535
Less: amounts offset in the Consolidated Statements of Financial Condition	0	0
Net amount presented in the Consolidated Statements of Financial Condition	44,581	18,535
Offsetting derivative positions	(5,239)	(2,674)
Cash collateral pledged	(39,970)	(15,861)
Net credit exposure	$ (628)	$ 0