Derivative Instruments and Hedging Activities - Offsetting Derivatives (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Gross amounts recognized	$ 91,170	$ 153,704
Less: amounts offset in the Consolidated Statements of Financial Condition	0	0
Net amount presented in the Consolidated Statements of Financial Condition	91,170	153,704
Offsetting derivative positions	(2,285)	(5,239)
Cash collateral pledged	0	0
Net credit exposure	88,885	148,465
Liabilities
Gross amounts recognized	30,729	44,581
Less: amounts offset in the Consolidated Statements of Financial Condition	0	0
Net amount presented in the Consolidated Statements of Financial Condition	30,729	44,581
Offsetting derivative positions	(2,285)	(5,239)
Cash collateral pledged	(26,470)	(39,970)
Net credit exposure	$ 1,974	$ (628)