Derivative Instruments and Hedge Activities - Summary of Amounts Included in Non-Interest Income in Consolidated Statements of Operations Relating to Derivative Instruments not Designated in Hedging Relationship (Details) - Non-Interest Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative [Line Items]
Amounts relating to derivative instruments, not designated in hedging relationship	$ 561	$ (735)
Other Credit Derivatives
Derivative [Line Items]
Amounts relating to derivative instruments, not designated in hedging relationship	5	(12)
Other Interest Rate Derivatives
Derivative [Line Items]
Amounts relating to derivative instruments, not designated in hedging relationship	$ 556	$ (723)