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Derivative Instruments and Hedge Activities - Summary of Company's Interest Rate Derivative and Offsetting Positions (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Gross amounts recognized	$ 13,463	$ 17,149
Less: Amounts offset in the Consolidated Statements of Financial Condition
Net amount presented in the Consolidated Statements of Financial Condition	13,463	17,149
Gross amounts not offset in the Consolidated Statements of Financial Condition
Offsetting derivative positions	(1,814)
Collateral posted	(11,649)	(17,149)
Net credit exposure
Derivative liabilities fair value	(12,348)	(18,133)
Less: Amounts offset in the Consolidated Statements of Financial Condition
Net amount presented in the Consolidated Statements of Financial Condition	(12,348)	(18,133)
Gross amounts not offset in the Consolidated Statements of Financial Condition
Offsetting derivative positions	1,814
Collateral posted	9,740	18,133
Net credit exposure	$ (794)

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