Derivative Instruments and Hedging Activities - Interest Rate Derivatives Designated as Hedges (Details) - Fair value hedge - Derivatives designated as hedging instruments: - Derivative - interest rate swap: $ in Thousands	Sep. 30, 2021 USD ($)
Derivative [Line Items]
Carrying Amount of the Hedged Liability	$ (299,678)
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Liability	$ 322